Big-Batch 400g (1.67 Cups) Sourdough Discard Soft Discard Pullman Sandwich Loaf Conversion & Acid Balance
High-discard jar clearout math: replacing 200g flour and 200g milk & water while neutralizing sourness with 2g baking soda.
Here is the whole conversion in one line: 400g of 100% hydration discard equals 200g of flour plus 200g of water, so a Soft Discard Pullman Sandwich Loaf mix moves from 500g / 320g to 300g / 120g once the discard is in. Add 2g of baking soda to neutralise the acid and give the lift, then cook at 375°F (190°C) for 35–40 min.
- Subtract Recipe Flour
- -200gUse 300g instead of 500g
- Subtract Milk
- -200gUse 120g instead of 320g
- Acid-Neutralizing Soda
- 2gReacts with discard lactic acid for CO2 lift
- Cook / Bake Spec
- 375°F375°F (190°C) for 35–40 min
Soft Discard Pullman Sandwich Loaf Conversion Grid: 400g Discard Against Neighbouring Doses
Neighbouring discard weights around 400g, useful when your jar remnant is larger or smaller than planned.
| Starter Water Ratio | Hidden Flour | Hidden Water | Flour to Weigh | Liquid to Weigh | Soda to Add |
|---|---|---|---|---|---|
| 75% starter, 400g serving [Anchor] | minus 228.6g flour | minus 171.4g liquid | 271.4g flour left | 148.6g liquid left | 2g NaHCO3 |
| 100% starter, 410g serving 50% Hydration | minus 205g flour | minus 205g liquid | 295g flour left | 115g liquid left | 2.1g NaHCO3 |
| 125% starter, 390g serving 75% Hydration | minus 173.3g flour | minus 216.7g liquid | 326.7g flour left | 103.3g liquid left | 2g NaHCO3 |
| 50% starter, 420g serving 125% Hydration | minus 280g flour | minus 140g liquid | 220g flour left | 180g liquid left | 2.1g NaHCO3 |
| 100% starter, 380g serving Standard 100% | minus 190g flour | minus 190g liquid | 310g flour left | 130g liquid left | 1.9g NaHCO3 |
Dynamic Stoichiometric Workbench (-200g)
Test custom loaf weights or alternative fermentation schedules directly against the -200g benchmark above.
Preventing Gummy Texture When Using a Large 400g Sourdough Discard Dose in Soft Discard Pullman Sandwich Loaf
Maillard browning depends on the sugar pool, and discard feeds that pool slowly. Because 400 grams of discard has already consumed most of its own maltose, the 500g of fresh flour in the soft discard pullman sandwich loaf recipe must supply the reducing sugars for crust colour at 375°F (190°C) for 35–40 min — so a dough with too much discard browns pale and unevenly.
Scaling the discard changes the soda proportionally. Every additional 100g of discard needs another 1.2g of baking soda, so at 400g you are working with 2g rather than a flat teaspoon, and the balance shifts further as the dose climbs.
How to Mix Soft Discard Pullman Sandwich Loaf with 400g Sourdough Discard
- Recalculate the Salt: Your 400 grams of discard was salted when it was last fed, so use slightly less salt than the original soft discard pullman sandwich loaf recipe calls for.
- Mix Discard into Flour (300g): Toss 300g of flour with the 400 grams of discard until every lump is coated.
- Add Liquid Gradually (120g): Pour in 120g of milk & water a little at a time until the batter comes together.
- Add 2g Soda and Cook: Stir in the bicarbonate, let it foam briefly, then take the soft discard pullman sandwich loaf to 375°F (190°C) for 35–40 min.
Key Baker's Math Questions (Subtract Recipe Flour: -200g)
Can I make this formula with 200g of discard instead?
Halve every weight: 100g of flour and 100g of liquid come out of the base formula, and you need 2g of baking soda.
Can I use 400g of active bubbly starter instead of unfed discard for soft discard pullman sandwich loaf?
Yes. Active starter and unfed discard carry the same hydration by weight (200g flour + 200g water), though active starter will also begin proving the batter. Always measure 400g on a digital scale rather than by cup volume (1.67 cups).
Does the type of soft discard pullman sandwich loaf matter when using 400g of discard?
Yes. High-moisture batters like soft discard pullman sandwich loaf tolerate a large discard dose because the extra 200g of water is offset by fat and sugar, while lean cracker doughs need the discard kept under about 10% of the flour weight.