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Recipe · v1.1

100% rye-flour pan loaf (Vollkornbrot)

Whole-grain rye · pan loaf · sourdough

Theoretical recipe. This formula has not been baked by the author yet. Real results and photos will appear after the first bake. For now it is an experiment plan and a basis for discussion.

100% rye-flour pan loaf Vollkornbrot-style on sourdough opara, without wheat flour, scald, or malt.

49 h 55 min Until bake ends
48 h 40 min Until bake starts
1 h 15 min Bake time
1 pan loaf (~880–920 g) Yield
Open worksheet
When to bake~2d 1h to bake

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Calculated for the current time; the worksheet lets you set any start.

Recipe

Current recipe

For baking now: the final working formula, ingredients, steps, and baking worksheet.

Taste & texture

Dense, fine-pored crumb — not open, but moist and cohesive after the mandatory 12-24 h rest. The crust is firm and thin with a matte surface. Flavor leads with earthy whole-rye grain notes and a clean, pronounced sourness from the large sourdough opara; no sweetness without malt or scald. The aftertaste is long and grainy with a slight mineral edge. No seeds or enrichments, so the rye character is unmasked: bakers describe 100% rye loaves as fruity-earthy and almost wine-like in complexity. Keeps well for 5-7 days wrapped, and flavor smooths and deepens by day two.

As described by: Zingerman's Bakehouse — Vollkornbrot , Yummy Sourdough — Sourdough German Vollkornbrot Rye Bread Recipe

Baking worksheet

About 100% rye-flour pan loaf Vollkornbrot-style; the densest crumb among the rye breads here
Key idea A mature sourdough opara with 40% prefermented flour and a mandatory 12+ hour rest turn 100% rye-flour bread from a brick into an edible dense crumb with clean acidity
Formula whole rye flour 500 g, water 400 g (80% hydration), salt 10 g; plus 20 g active rye starter at 100% hydration in the opara. Including the active starter, the dough contains 510 g flour and 410 g water: effective hydration 80.4%, salt 1.96%
Why opara 1:10:10 20 g active starter + 200 g flour + 200 g water is a warm overnight opara. At 24–27 °C it should mature in 10–14 hours without sharp vinegar; if the kitchen is below 24 °C, hold it closer to 27 °C or judge by the dome rather than the clock.
Starter 3 refreshments: 5+10+10 → 5+15+15 → 5+20+20; from the small active jar, 15–20 g goes to the refrigerator as a reserve and 20 g goes into the opara as active starter
Opara 200 g rye flour + 200 g water + 20 g active starter; 10–14 hours at 24–27 °C to a dome and a milky-sour smell
Mix thick paste, not wheat dough; K-beater on Min 1–2 minutes to homogeneity, no windowpane to look for
Proof 24–28 °C until 1.5–1.8x rise; expect 1.5–3 hours, decide by the dough's look
Bake 250 °C 10 min with steam → 200 °C 30 min → 170 °C 30 min to 98–99 °C internal
Slice never before 12 hours after baking, ideally 24 hours; the rye crumb needs stabilization

Good to know

Why is 100% rye flour the densest crumb in the course?

100% rye flour has no gluten network like the one wheat dough uses to hold large pores. Structure is held by starch, pentosans, and acidity; the result is a dense fine-pored crumb, and that is normal for Vollkornbrot, not a defect.

Why are 12 hours of rest mandatory?

Right out of the oven the rye crumb is still unstable: the hot starch gel and bound water must redistribute. A slice at 1–2 hours will show stickiness that disappears in 12 hours.

Can it be baked as a hearth loaf, without a pan?

Pure 100% rye-flour dough holds a hearth shape poorly without rye sifted flour or a grain base. For the control lesson it is simpler to use a pan and not mix variables.

Why such a large opara (40% prefermented flour)?

In 100% rye-flour bread the opara acidity makes the crumb edible: without it rye-flour enzymes destroy the starch and the bread turns gummy. 40% is the lower working bound for home Vollkornbrot.

This is a pure 100% rye-flour bread: no wheat flour, no scald, no malt, and no spices. The whole point is to see how a sourdough opara and a mandatory rest turn the densest rye formula from a brick into an edible loaf with clean acidity — where the line between dense and gummy lies, and how to tell an opara error from a hydration or bake error.

How It’s Baked Around the World, and Why

A 100% rye loaf is the everyday bread of the northern grain belt — Germany, the Baltics, Poland, Scandinavia, and Russia — wherever the climate favored rye over wheat. The shared logic is the same everywhere: rye flour cannot be raised by yeast and gluten the way wheat is, so the structure is built on sour fermentation and a long, gentle bake in a tin.

Germany’s Vollkornbrot is the textbook version — coarse wholemeal rye, often with cracked grain or rye chops soaked in, baked low and slow for an hour or more in a Pullman-style tin, then rested for a day. Northern logic again: a dense, moist, keeping bread that slices thin and lasts a week. The Baltic and Polish ruginė / razowy breads run the same playbook, sometimes lifting the share of sifted rye flour for a lighter crumb. Russian and Ukrainian black breads add a scald (zavarka) and red rye malt for sweetness and color, but the backbone — a big mature sour, a tin, a full bake — is identical.

Why a tin and not a hearth? Pure rye dough has no gluten net to hold a free-standing shape; without sifted flour or a grain base it would spread. The tin contains it until acidity and gelatinized starch set the crumb. Why so much sour? Because rye amylase stays active deep into the bake and will liquefy starch unless a low pH stops it — the reason every traditional 100% rye recipe leans on a large, well-soured preferment. And why the day-long rest? The hot rye crumb is a starch gel still holding free water; cut it early anywhere and it smears. The rest is not a serving suggestion — it is the last step of the bake.

Theory of 100% Rye-Flour Bread

In wheat bread the main scaffold is the gluten network. In 60/40 half of that work is done by wheat flour. In 100% rye flour there is almost no gluten: structure is held by starch, pentosans, and acidity.

| Mechanism | Role in 100% rye flour | What to check | | --- | --- | --- | | Sourdough opara | Main source of gas, acidity, and enzyme control | Dome, bubbles, sour rye smell without vinegar | | Acidity | Stops rye-flour amylase from destroying starch | Opara smell, crumb density after rest | | Pentosans | Bind water and hold the dough, imitating a gel | Thick paste, not a flowing dough after mixing | | Starch | After baking forms the main crumb scaffold | 98–99 °C internal, mandatory rest | | Pan | Holds the dough until acidity and starch take over the work | Starting height, 1.5–1.8x rise |

If the opara is weak, the crumb will be sticky and gummy even with an ideal bake. If the opara is working but the bread is cut after an hour, the crumb will look sticky by mistake.

Why the Opara Is So Large

This loaf uses 40% prefermented flour — the lower working bound for a home 100% rye-flour bread. A smaller share will not give enough acidity, and rye-flour amylase will destroy the starch during baking. On the slice this looks like a gummy band at the bottom or a transparent moist zone.

| Share of prefermented flour | Expected result | | --- | --- | | 20–30% | Often not enough for 100% rye flour; risk of gumminess | | 40% | Working baseline here | | 50%+ | Stronger acidity, denser crumb, profile closer to classic Vollkornbrot |

Once the bread reliably works, the opara share can shift up or down — but change only one variable at a time per bake.

Why Three Refreshments from the Refrigerator

This bread does not use the culture straight from the refrigerator. After long storage, wild yeast in the starter is slowed, and the balance is shifted toward lactic acid bacteria. Three refreshments at 5+10+10 → 5+15+15 → 5+20+20 are needed for two things:

  1. Boost yeast activity for normal opara rise.
  2. Clear the flavor profile from the sharp vinegar accumulated in the refrigerator.

After the third refreshment, out of the small active jar, 15–20 g goes to the refrigerator as the new mother-culture reserve, 20 g goes into the opara as active starter, and the small remainder covers jar and weighing losses.

How a 100% Rye-Flour Crumb Holds Together

In wheat dough the key question is “did the windowpane develop?”. In 100% rye-flour dough this question does not exist at all. The main question is: “is there enough acid, gas, and bound water?”.

A thick paste after mixing is normal. Dough stickiness on the hands is normal. The dough should not “pull away from the bowl walls”; it should not “gather into a ball”. Trying to knead it like wheat — Kenwood with the hook for 10 minutes — will destroy the fragile pentosan gel structure, and the crumb will turn out denser, not lighter.

Rest as Part of the Recipe

12 hours after baking is not “advice” but a working part of the recipe.

| Slice time | What you see | | --- | --- | | 1–2 hours | Hot sticky crumb, knife smears, falsely looks like gumminess | | 6–8 hours | Partially stabilized, but moisture is still redistributing | | 12 hours | Minimum window for honest assessment | | 24 hours | The best window for this loaf | | 48 hours | Flavor settled, acidity smoothed |

If the crumb seems sticky at 12 hours on the first run, check at 24 hours. Often it is not gumminess but a lack of rest.

Full Course Map

Bread curriculum — where this rye loaf sits in the overall track.

Theory Sources

If Something Goes Wrong

  • Gummy crumb under the knife at 12 h — pentosans have not finished resting; wait a full 24 h before slicing, 36 h next time.
  • Gummy band at the bottom, or a transparent moist zone — rye amylase outran the acid; raise the opara share toward 50% or give the opara longer, and make sure it smells pronouncedly sour.
  • Dome fell in the oven — overripe opara or overproof; hold the opara to 1.8–2.5x only and proof the loaf to 1.5–1.8x.
  • Sharp vinegar smell — opara over-soured (12+ h at 27+ °C); shorten to 10 h or refrigerate it after 6 h.
  • Crust separates from the crumb — fermentation too weak; ripen the opara overnight at 24–27 °C rather than cold.
  • Dough tears on the bench — normal for 100% rye flour, which gives no windowpane; work with wet hands and do not add flour.

Ingredients

Change any amount — the rest rescale by the bread’s formula.

Component Grams Baker's %
Whole rye flour g 100%
Water g 80%
Salt g 2%
Active rye starter, 100% hydration g 4%

Ingredient details

Whole rye flour

Split
200 g into the sourdough opara and 300 g into the final dough
Brand the author uses
record the brand and milling before baking
Production date
record before mixing

Water

Split
200 g into the sourdough opara and 200 g into the final dough
Temperature
room temperature; record actual dough temperature after mixing

Salt

Important
if the salt is coarse, dissolve it in water or grind finer

Active rye starter, 100% hydration

Role
active starter for the sourdough opara from the final refreshment
Accounting
included in opara and dough mass; formula flour/water stay 500/400 g excluding that active starter, matching the working-sheet convention

Conditions and equipment

Conditions

Focus
100% rye flour, sourdough opara, dense crumb, mandatory rest
Doneness temperature
98–99 °C internal; probe thermometer required
Done right when
the 100% rye-flour crumb stabilizes for 12+ hours and the knife does not stick

Equipment

Pan
rectangular pan loaf form (Emile Henry Petit Moule Cake or similar volume)
Mix
Kenwood KVC85.004SI, K-beater on Min; do not use the hook
Oven
top-bottom heat, hand steam or steam generator on the start phase
Control
probe thermometer, scale, starting-height mark for the dough

Nutrition: how to eat this bread

Bread nutrition facts

Per 100 g of bread

185 kcal

protein 5.3 g · fat 1.1 g · carbs 37.7 g

Per slice (50 g)

93 kcal

protein 2.7 g · fat 0.6 g · carbs 18.9 g

Automatic calculation from USDA + Skurikhin database for the baked loaf after evaporation. Numbers are approximate: 1) the database covers ingredients, not finished dough; 2) bake water loss is assumed at 10% — actual loss depends on crust, time, and pan. Add 5–10% in calorie trackers if needed.

Bread is a source of starch and energy. Its nutrition depends on flour, fermentation, salt, enrichment, serving size, and the rest of the plate.

Digestion
More whole grain, fibre, and fermentation usually mean longer satiety. White flour eaten alone is generally digested faster.
Helpful or harmful
Bread is not poison or medicine by itself. Overall diet matters; current guidance prioritizes whole grains, vegetables, fruits, and pulses.
Amount
For most learning tastings, 1–2 slices, about 30–80 g, is enough depending on loaf density.
Best pairings
Pair with protein, vegetables, and moderate fat; avoid making it a large standalone portion with sweet drinks or sweet spreads.

How to eat

  • Taste the bread plain for learning, then eat it as part of a balanced plate.
  • Slice dense rye thinner; with soft white bread, make sure softness does not automatically increase the serving.

Limits

  • Wheat and rye breads contain gluten.
  • For medical conditions, adjust bread type and serving size with a clinician or dietitian.
Sources

Instructions

  1. Prepare the starter

    Take the rye-flour starter out of the refrigerator. Do 3 refreshments: 5+10+10 → 5+15+15 → 5+20+20; the final refreshment is small and should be used at peak.

  2. Set aside reserve and build the opara

    Before building the opara, set aside 15–20 g of active starter into a clean jar and put it in the refrigerator. Mix 200 g rye flour, 200 g water, and 20 g active starter. Hold 10–14 hours at 24–27 °C to a dome and a milky-sour smell.

  3. Mix

    Put all the opara, 200 g water, 10 g salt, and 300 g rye flour into the Kenwood bowl. Mix with K-beater on Min 1–2 minutes to homogeneity; stickiness is normal.

  4. Transfer to the pan

    Grease the pan, transfer the dough, smooth with a wet spoon or wet fingers; mark the starting height and dough mass.

  5. Proof

    Proof at 24–28 °C to 1.5–1.8x rise; cues — top slightly domes, fine cracks appear.

  6. Bake

    Timers: 250 °C 10 minutes with steam, 200 °C 30 minutes, 170 °C 30 minutes to the first probe check; if the inside is below 98 °C, add 5-minute top-ups at 170 °C.

  7. Rest

    Remove from the pan, cool on a rack uncovered, wrap in cotton/linen. Do not slice earlier than 12 hours, ideally 24 hours. The slice is needed for the crumb conclusion.

A compact step map; notes and comments live in the worksheet.

R1-C3: Vollkornbrot working sheet

The sheet checks a 100% rye-flour pan loaf on sourdough opara. Three refreshments bring the culture to peak, the opara is assembled overnight, mixing and baking happen in the morning, and the slice waits at least 12 hours.

  1. Day 1, 10:00–20:00

    Refreshment 1

    Take the rye-flour starter out of the refrigerator. Mix 5 g rye starter, 10 g water, and 10 g whole rye flour. Base ratio for long fridge storage: 1:2:2. Hold at ~24 °C.

    Step ingredients

    • Starter 5 g rye-flour starter
    • Water 10 g
    • Rye flour 10 g
    • Yield about 25 g
    Target
    Starter wakes up, shows rise and a clean smell without sharp vinegar.
    Check
    Record the exact time of the first refreshment for journal export.
    Evidence
    Side photo of the jar, time, temperature near the jar.

    10 h timer for this step

  2. Day 1–2, 20:00–08:00

    Refreshment 2

    When the first stage gives confident rise, bubbles, and a clean smell, do refreshment 2 at 1:3:3. If the starter is not ready, hold to a clear peak and record the delay.

    Step ingredients

    • Starter from refreshment 1 5 g
    • Water 15 g
    • Rye flour 15 g
    • Yield about 35 g
    Target
    Confident rise after the first refreshment; the next step needs predictable activity.
    Check
    Do not move on by clock alone if the starter has clearly not woken up.
    Evidence
    Time, temperature.

    12 h timer for this step

  3. Day 2, 08:00–18:00

    Refreshment 3

    When refreshment 2 gives a confident peak, do the small final refreshment at 5+20+20. If refreshment 2 shifted, shift this step as well.

    Step ingredients

    • Starter from refreshment 2 5 g
    • Water 20 g
    • Rye flour 20 g
    • Yield about 45 g: 15–20 g reserve to the refrigerator, 20 g active starter for the opara, 5–10 g technical margin for jar losses
    Target
    Active rye starter at or near peak without a large excess jar.
    Check
    Before building the opara, first move 15–20 g of active starter to a clean jar and put it in the refrigerator; weigh exactly 20 g active starter into the opara. Do not mix the whole jar in.
    Evidence
    Peak time, temperature.

    10 h timer for this step

  4. Day 2–3, 18:00–08:00

    Sourdough opara

    Before building the opara, separately set aside 15–20 g of mature starter into a clean jar and put it in the refrigerator — this is the mother-starter reserve for future bakes. Only the needed active starter goes into the opara. Mix 200 g whole rye flour, 200 g water, and 20 g active starter from the small refreshment 3. Cover and hold at 24–27 °C to a dome and a milky-sour smell.

    Step ingredients

    • Whole rye flour 200 g
    • Water 200 g
    • Active rye starter, 100% hydration 20 g from what remains after the reserve
    • Yield about 420 g sourdough opara
    Target
    Opara has risen 1.8–2.5x, bubbles throughout, sour rye smell without sharp vinegar.
    Check
    If the kitchen is cool, hold closer to 27 °C. If the opara has clearly overripened and collapsed sharply, you can use it, but the crumb will be more sour.
    Evidence
    Time, temperature.

    14 h timer for this step

  5. Day 3, 08:00–08:05

    Mix

    Put all the opara (about 420 g) into the Kenwood bowl, add 200 g water and 10 g salt, stir. Add 300 g whole rye flour. Mix with K-beater on Min for 1–2 minutes only to full homogeneity, not the hook and not to a windowpane.

    Step ingredients

    • Sourdough opara all of it, about 420 g
    • Water 200 g
    • Whole rye flour 300 g
    • Salt 10 g
    • Dough yield about 930 g
    Target
    Thick sticky paste without dry pockets; dough temperature after mixing 26–28 °C.
    Check
    Do not look for a windowpane and do not add flour because of stickiness. On Kenwood the goal is the same: only homogeneity, no long kneading.
    Evidence
    Dough temperature after mixing, texture photo.

  6. Day 3, 08:05–08:10

    Transfer to the pan

    Grease the pan, transfer the dough, smooth with a wet spoon or wet fingers.

    Step ingredients

    • Dough after mixing all of it, about 930 g
    • Pan grease thin layer, not part of the formula
    Target
    Even surface, clear starting height.
    Check
    Mark the dough height in the pan and the dough mass.
    Evidence
    Side photo, height mark, mass.

  7. Day 3, 08:10–10:40

    Proof

    Proof at 24–28 °C to 1.5–1.8x rise. For 100% rye flour the rise is usually slower than in 60/40.

    Step ingredients

    • Dough in the pan all of it, about 930 g
    • New ingredients none added
    Target
    Top slightly domes, fine cracks or bursting bubbles appear.
    Check
    Record state, not only time; for 100% rye flour a strong dome is not mandatory.
    Evidence
    Kitchen temperature, height.

    2 h 30 min timer for this step

  8. Day 3, 10:40–10:50

    Oven 250 °C + steam

    Place the pan on the rack, add steam at the start. Bake 10 minutes at 250 °C.

    Step ingredients

    • Dough after proof all of it in the pan
    • Steam water for steam; not part of the dough formula
    Target
    Initial heat and moist surface.
    Check
    When the timer rings: remove steam and drop to 200 °C.
    Evidence
    Timer, oven mode.

  9. Day 3, 10:50–11:20

    Oven 200 °C

    Bake 30 minutes at 200 °C without extra steam. 100% rye flour needs a longer main heating.

    Step ingredients

    • New ingredients none added
    Target
    Main heating of the loaf and shape setting.
    Check
    When the timer rings: drop to 170 °C.
    Evidence
    Timer, crust state.

    30 min timer for this step

  10. Day 3, 11:20–11:50

    Oven 170 °C · first check

    After dropping to 170 °C set a 30-minute timer. At the end of the timer do the first probe check.

    Step ingredients

    • New ingredients none added
    Target
    Understand how much remains until 98 °C in the crumb center.
    Check
    If already 98 °C — go to removal. If less than 98 °C — add 5-minute steps.
    Evidence
    Probe and timer.

    30 min timer for this step

  11. Day 3, 11:50–11:55

    Top-up at 170 °C

    If after the first check the inside is below 98 °C, set a 5-minute timer and check again. Repeat until 98–99 °C.

    Step ingredients

    • New ingredients none added
    Target
    98–99 °C in the crumb center.
    Check
    If the top darkens before doneness, cover with foil. When the center reaches 98 °C, remove the bread from the oven.
    Evidence
    Probe, timer.

  12. Day 4, 07:00–19:00

    Slice

    Cool on a rack 2–3 hours uncovered, then wrap in cotton/linen. Slice after 12 hours as the earliest, ideally 24 hours. For 100% rye flour the rest is not optional — it is part of the recipe.

    Step ingredients

    • Finished loaf whole loaf after the rest
    • New ingredients none added
    Target
    Crumb dense, moist but not gummy; the knife does not stick.
    Check
    Describe acidity, knife stickiness, density, flavor. If the early slice was sticky, repeat at 24 hours.
    Evidence
    Tasting note, slice photo.

    12 h timer for this step

Version history

  • v1.1July 1, 2026in development
    Problem
    The formula and working sheet used different masses: the sheet built the opara from 200 g flour + 200 g water + 20 g active starter, but recipeMath counted the opara as 400 g and the top ingredient list did not show that active starter.
    Change
    Added 20 g active rye starter at 100% hydration to visible ingredients and recipeMath; corrected sourdough opara mass to 420 g. Base baker's percentages for flour/water remain on 500/400 g, and the cheatsheet now shows the effective active-starter-inclusive formula: 510 g flour, 410 g water, 80.4% hydration.
    Conclusion
    The working sheet now matches the actual mix: about 420 g opara and about 930 g dough.