S2-C7: Soft pan loaf on sourdough opara
Seventh lesson of the soft wheat track: pan loaf on a sourdough opara, where the goal is softness and flavor without sharp acidity.
Recipe
Current recipe
For baking now: the final working formula, ingredients, steps, and baking worksheet.
Baking worksheet
Lesson block: soft pan loaf on a sourdough opara
S2-C7 tests a young sourdough opara at 20% in a soft pan loaf with a 1.13% yeast backup. The goal is flavor and aroma deeper than the S2-A1 baseline, without sharp acidity and without losing the schedule.
- Lesson question
- Can a deeper flavor of soft sliced bread be reached through a young sourdough opara without turning the bread sour and without a multi-day plan.
- Main variable
- Sourdough opara at 100% hydration (80 g flour + 80 g water + 10 g mother starter, 20% prefermented flour) plus a small backup yeast dose of 4.5 g (1.13%).
- Why this way
- A young opara (10–12 hours at 24 °C) gives enzymatic aromas and a mild lactic tang but does not build up sharp vinegar; the backup yeast keeps the schedule so the lesson runs in one day, not in three.
- Expected flavor
- Creamy-milky wheat profile with a mild enzymatic depth, aroma without a vinegar note, tender elastic crumb, golden crust, aftertaste longer than the S2-A1 baseline.
- Learning format
- Multi-day plan: evening of Day 1 — refresh the mother starter and assemble the 100% hydration opara; night — maturation 10–12 h at 24 °C; morning of Day 2 — mix, bulk, shape, proof, bake.
Theory
- A young opara differs from a mature one by time and temperature: 10–12 h at 24 °C give a lactic profile; 14–18 h at 26 °C drift to sharp vinegar and read as a defect in soft bread.
- 20% prefermented flour is the working bound for soft pan logic; at 30%+ the bread becomes noticeably sour and less sliceable; at 10% the opara effect is barely readable.
- A backup yeast dose of 1.13% (instead of the usual 1.5%) keeps the schedule within a day and compensates the lower gas-producing activity of a young opara.
- Milk powder at 3.5% is kept in the formula to isolate the variable: only the fermentation type changes, not the dairy component.
- Before building the opara, set aside 15–20 g of active mother starter in a clean jar in the refrigerator as a reserve; three refreshments from the refrigerator at 5+10+10 → 5+15+15 → 20+85+85 are needed if the culture has not been used for a while.
- The opara is ready when it has risen 2–2.5x, with a dome and bubbles throughout the volume, and a milky-sour smell without vinegar sharpness.
Checkpoints
- Before building the opara, set aside 15–20 g of active starter in the refrigerator as a mother-culture reserve.
- Opara 10–12 hours at 24 °C: dome, bubbles, milky-sour smell, no vinegar note.
- Final dough temperature after mixing 25–26 °C; butter incorporated after initial development.
- Bulk 60–90 minutes; rely on a 50–70% rise, not only minutes.
- At 24 hours, assess the slice acidity: it should read as a soft lactic depth, not as sharp vinegar.
Sensory
- Crust
- color, thickness, crunch, score opening, bitterness, toastiness
- Crumb
- moisture, elasticity, gumminess, chew, pore size and distribution
- Aroma
- separate crust and crumb aroma: floury, yeasty, milky, rye, malty, spicy
- Flavor
- sweetness, salt, acidity, flouriness, depth, aftertaste
- Score
- 0–10 plus one decision: repeat, increase fermentation, change flour, change bake, or close the lesson
What comes next
- If acidity shifts to sharp vinegar, in the next version shorten opara maturation to 8–10 hours or lower the temperature to 22 °C.
- If the opara effect is barely readable, raise the prefermented-flour share to 25% or give the opara 12–14 hours at 24 °C.
- The next lesson S2-C8 tests potato puree as a starch path to softness without a sourdough component.
S2-C7 brings sourdough into a soft pan loaf. The point here is not acidity for its own sake but controlled fermentation.
The lesson’s main question: can a soft pan loaf be made on a sourdough opara without a sharp sour flavor?
What We Study
- how to control sourdough opara acidity
- how to tell sourdough flavor from acidity
- how to read the fermentation of a soft sourdough dough
- How to record the result so the next repeat changes one variable.
- How to tell a formula error from a process error.
Why This Lesson Is Here
After the dairy-free loaf it is logical to check whether a soft pan loaf can be sourdough-based but not sour.
Theory
The acidity of a soft bread depends on opara maturity, temperature, the share of prefermented flour, and the length of the final proof. An overripe opara gives sharpness and a weak structure. A small yeast dose here does not replace sourdough; it reduces the risk of the overnight schedule.
| Mechanism | Practical takeaway |
|---|---|
| Main variable | a young sourdough opara at 100% hydration plus a small backup yeast dose |
| Fermentation | Judge readiness by dough state, not by the timer |
| Bake | Check doneness by temperature and crust state |
| Cooling | Assess the crumb after stabilization |
How This Would Be Taught in a Strong School
| Class block | What the student does | What is assessed |
|---|---|---|
| Formula | Recalculates grams and percentages | No double counting |
| Mix | Records temperature and development | Dough not overheated |
| Fermentation | Decides by state | No blind clock-watching |
| Shape | Repeats the shape without random flour | Geometry and seam are clear |
| Bake | Uses a probe thermometer | No underbake or overdrying |
| Sensory | Separates flavor, softness, and defects | Conclusion leads to the next version |
S2-C7 Lab Protocol
| Control point | What to record for the opara + backup yeast | Why |
|---|---|---|
| Setting the opara in the evening | 80 g flour + 80 g water + 5 g starter, t° 24–26 °C | start the opara 8–12 h before peak |
| Morning opara check | dome, bubbles, milky-fruity smell (not vinegary) | use at peak or right after |
| Before mix | 160 g mature opara + 320 g flour + 82 g water + 100 g milk + 4.5 g yeast | split flour/water: 80 g already in the opara, and 100 g milk carries ~88 g water |
| After mix | dough temperature 25–26 °C, smoothness | the sourdough opara accelerates fermentation |
| After fermentation | rise 1.7–2x, light fermented aroma | confirm the opara has not overshot |
| Before bake | height, slow finger return in 3–5 seconds | backup yeast + opara give a faster proof |
| After cooling | flavor (soft sourdough, no sharp acidity), softness | check: the opara adds aroma without losing softness |
Advanced Technological Map
The opara is set in the evening and used at peak or right after peak. Oil, sugar, and milk should not mask an overripe sourdough.
Formula
Free water and flour in the table are counted for the whole recipe, including 80 g flour and 80 g water inside the sourdough opara. Milk 3.2% adds another ~88 g water and ~12 g solids, so effective hydration is ~62.5% (250 g water per 400 g flour). Working addition after the opara matures: 160 g opara + 320 g flour + 82 g water + 100 g milk + the rest of the ingredients.
| Ingredient | Grams | % to flour |
|---|---|---|
| Strong white bread flour | 400 g | 100 |
| Water | 162 g | 40.5 |
| Milk 3.2% | 100 g | 25 |
| Sourdough opara 100% hydration | 160 g | 40 |
| Sugar | 26 g | 6.5 |
| Vegetable oil | 22 g | 5.5 |
| Salt | 8 g | 2 |
| Fresh yeast | 4.5 g | 1.13 |
Schedule
The exact schedule is set by the working sheet. What matters is not absolute time but the alignment of three things: dough state, temperature, and the step goal. If the dough runs faster or slower, change the wait time, not the formula.
Practical Technique
Use an active opara, run bulk by rise, and bake the pan loaf to a stable internal temperature.
Diagnosing Errors
| Symptom | Cause for opara dough with backup yeast | What to check |
|---|---|---|
| Sour, vinegary aftertaste | opara overripe (more than 12 h or hot kitchen) | use the opara at peak (dome, no collapse), t° 24–26 °C |
| Bread shot up very fast and collapsed | yeast + ripe opara = double boost | shorten bulk or reduce yeast to 3 g |
| Crumb dense but the opara was active | yeast too young or too old | check the fresh-yeast date; in a trial proof raise to 5 g |
| Opara did not grow in 8–12 h | cold kitchen (less than 22 °C) or weak starter | refresh the starter twice in a row, check kitchen t° |
| Aroma without acidity and without complexity | opara used too young (did not reach peak) | hold the opara until a clear dome and light bubbles appear |
| Bread collapsed in the oven | final proof overshot due to double boost | shorten final proof by 20–30 minutes |
How to Assess the Result
| What to assess | Good sign |
|---|---|
| Shape | matches the lesson goal |
| Crust | does not become bitter or interfere with softness |
| Crumb | stable after cooling |
| Flavor | linked to the main variable |
| Repeatability | clear what to change next time |
Grading Rubric
| Criterion | 0 points | 1 point | 2 points |
|---|---|---|---|
| Opara maturity | opara collapsed or did not rise | dome present, bubbles uneven | tight dome, fine bubbles on the surface, milky aroma |
| Opara use time | used more than 14 h after setting | in the 10–14 h window | at peak 8–12 h |
| Yeast dosage | 0 g (sourdough only) or more than 6 g | 3 g or 6 g | 4.5 g = backup dose, written into the formula |
| Aroma | sharp vinegar or bland | weak acidity | soft fermented, milky-fruity |
| Crumb structure | dense or with large holes | average | even and soft, pan geometry |
| Freshness at 24 h | dry | soft | soft, aroma preserved |
Control Questions
- Was the opara set 8–12 hours before mixing at t° 24–26 °C?
- By morning is there a dome and fine bubbles on the opara (peak)?
- Is the opara smell milky-fruity, without vinegar sharpness?
- Of the 400 g flour, 162 g water, and 100 g milk, are 80 g flour and 80 g water already counted in the opara?
- Backup yeast dose 4.5 g is not increased (otherwise the opara becomes decorative)?
- Dough temperature after mixing 25–26 °C?
- Final proof shortened by 20–30 minutes vs. a yeasted formula (the opara accelerates it)?
- After cooling — soft fermented aroma, no sharp acidity?
Lesson Conclusion
The lesson is closed if the bread has a soft crumb, a light fermented aroma, and does not slide into sharp acidity.
Theory Sources
- Modernist Bread: are biga, poolish, and sponge interchangeable? — source for proportions, technique, or lesson diagnostics.
- King Arthur Baking: pain de mie with a starter — source for proportions, technique, or lesson diagnostics.
- King Arthur Baking: storing yeast bread — source for proportions, technique, or lesson diagnostics.
Ingredients
| Component | Grams | Baker's % |
|---|---|---|
| Strong white bread flour | 400 g | 100% |
| Water | 162 g | 40.5% |
| Milk | 100 g | 25% |
| Sugar | 26 g | 6.5% |
| Vegetable oil | 22 g | 5.5% |
| Salt | 8 g | 2% |
| Fresh yeast | 4.5 g | 1.13% |
Preferments, scalds, and old dough are shown as prepared components; their composition is listed in the row details and worksheet.
Ingredient details
Strong white bread flour
- Author's brand
- MukaMuka 13.5% protein (mukamuka.ru)
- Alternatives
- Aleyna Vivapol 12-13%, King Arthur Bread Flour 12.7%
Water
- Split
- 80 g in the opara, 82 g in the final dough
- Author's brand
- Tap water through Barrier Iron x2 filter
- Alternatives
- any filtered or bottled drinking water
Milk
- Role
- softens the crumb and adds milky aroma to the sourdough fermentation
- Composition (for water math)
- Whole milk 3.2% contains ~88% water (USDA FoodData Central, ID 171265). For 100 g of milk, ~88 g water. Effective dough hydration = 80 g in the opara + 82 g free + 88 g from milk = 250 g water per 400 g flour (~62.5%).
- Author's brand
- Lebedyan 3.2%
- Alternatives
- any 3.2% milk (Prostokvashino, Domik v Derevne)
Sugar
- Author's brand
- White sugar, no specific brand
- Alternatives
- any white sugar; for brown — Mistral demerara
Salt
- Author's brand
- Pink Himalayan salt
- Alternatives
- sea or table salt (avoid iodized)
Fresh yeast
- Author's brand
- Lux (Voronezh) fresh or Ayrek (homemade)
- Alternatives
- any fresh yeast in 100 g pack
Conditions and equipment
Conditions
- Status
- S2-C7: published learning lesson
- Learning block
- soft sourdough pan loaf
- Constraint
- do not increase the opara share and do not run it to sharp acidity
- Lesson-closure state
- The lesson is closed if the young opara is brought to the correct maturity window and the contribution of backup yeast to the rise is recorded without losing the sourdough character.
Equipment
- Pan
- Emile Henry Petit Moule Cake 1.1 L (ceramic, 22×9,5×6,5 cm) or a similar-volume metal 9×5 inch pan
- Mixing
- planetary mixer with a hook, or hand mixing with recorded time and temperature
- Bake
- home oven, probe thermometer, cooling rack
Nutrition: how to eat this bread
Bread nutrition facts
Per 100 g of bread
280 kcal
protein 8.1 g · fat 4.9 g · carbs 49.9 g
Per slice (50 g)
140 kcal
protein 4.1 g · fat 2.5 g · carbs 25 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.
Instructions
-
Sourdough opara 100% hydration
Mix 20 g mature 100% mother starter, 70 g flour, and 70 g water for a 100% hydration opara.
-
Maturation
Leave to peak or a slight start of collapse.
-
Mix
Combine the preferment with the final ingredients and mix to a soft dough.
-
Bulk fermentation
Carry on until noticeable rise, gas, and a lively surface.
-
Shape
Shape a log and place in the pan.
-
Final proof
Proof to puffiness and slow finger-poke return; check height and surface stability.
-
Bake
Bake by the working-sheet regime to the target internal temperature.
-
Cool and assess
Cool completely, slice, and record the conclusion by the lesson's main variable.
For readers who want to understand why the formula changed.
S2-C7 hypothesis
20% prefermented flour in a young sourdough opara will give flavor and softness without sharp acidity, while a small dose of yeast keeps the schedule.
Iteration analysis
01 One variable matters more than a beautiful formula
- Observation
- Sourdough in soft bread easily produces acidity and density, while a fully yeast-free regime is less predictable in a learning sheet.
- Hypothesis
- 20% prefermented flour in a young sourdough opara will give flavor and softness without sharp acidity, while a small dose of yeast keeps the schedule.
- Decision and why
- Limit the opara to 20% flour, keep it young, and add a small yeast dose only to support the schedule.
- Conclusion
- soft pan loaf with a clean sourdough aroma without sharp acidity
02 The working sheet must match the formula
- Observation
- Ingredients, stages, and schedule are written so that the working sheet matches the formula.
- Hypothesis
- If the formula and the sheet diverge, the tasting conclusion loses meaning.
- Decision and why
- Added formula math, schedule with relative times, and comments at each step.
- Conclusion
- The formula, working sheet, and tasting conclusion must stay linked by the lesson's single variable.
Version history
- v1.1May 26, 2026in development
- Problem
- The ingredient was labeled "Milk powder 14 g" with brand "Lebedyan 3.2%" (a liquid milk) — readers following the brand would add a token amount of liquid milk with no effect.
- Change
- Replaced milk powder with 100 g of liquid 3.2% milk using the composite pattern (88 g water + 12 g solids). Free water reduced from 270 g to 162 g; effective hydration ~62.5%.
- Result
- Author's brand (Lebedyan 3.2%) now matches the ingredient type; nominal hydration adjusted from 67.5% to 62.5% (some water now comes from 88% milk); effective total liquid ~65.5% of flour.
Questions
Why does S2-C7 sit in this place in the course?
After the dairy-free loaf it is logical to check whether a soft pan loaf can be sourdough-based but not sour.
Can several parameters be changed at once?
No. The lesson is built around one variable; other changes belong in a separate version.
What counts as the main result?
Smell the opara before mixing: the smell should be yogurt-like, without a sharp vinegar note. After baking, assess the crumb aroma at 4 and 24 hours: a clean sourdough profile without harsh acidity. If sharp acidity appeared, shorten the opara time by 1–2 hours in the next repeat.