Big-Batch 300g (1.25 Cups) Sourdough Discard Same-Day Sourdough Discard Focaccia Conversion & Acid Balance
High-discard jar clearout math: replacing 150g flour and 150g warm water while neutralizing sourness with 1.5g baking soda.
Want a tender, faintly tangy same-day sourdough discard focaccia? Use the discard, but budget for it. 300g of 100% hydration discard supplies 150g flour and 150g water, so pull 150g off the 500g flour and 150g off the 400g of warm water. That leaves 350g / 250g plus 1.5g of baking soda, and it bakes at 450°F (230°C) for 22–25 min.
- Subtract Recipe Flour
- -150gUse 350g instead of 500g
- Subtract Warm
- -150gUse 250g instead of 400g
- Acid-Neutralizing Soda
- 1.5gReacts with discard lactic acid for CO2 lift
- Cook / Bake Spec
- 450°F450°F (230°C) for 22–25 min
Same-Day Sourdough Discard Focaccia Conversion Grid: 300g Discard Against Neighbouring Doses
The 100% hydration row is your primary target; the 50% and 125% rows show how the deduction changes with a wetter or stiffer discard.
| Starter Water Ratio | Hidden Flour | Hidden Water | Flour to Weigh | Liquid to Weigh | Soda to Add |
|---|---|---|---|---|---|
| Discard 290g (50% hydration) [Primary] | flour inside 193.3g | water inside 96.7g | use 306.7g fresh flour | use 303.3g Warm Water | soda 1.5g |
| Discard 320g (100% hydration) Leaner Dough | flour inside 160g | water inside 160g | use 340g fresh flour | use 240g Warm Water | soda 1.6g |
| Discard 300g (125% hydration) Wetter Dough | flour inside 133.3g | water inside 166.7g | use 366.7g fresh flour | use 233.3g Warm Water | soda 1.5g |
| Discard 280g (75% hydration) Tight Dough | flour inside 160g | water inside 120g | use 340g fresh flour | use 280g Warm Water | soda 1.4g |
| Discard 310g (100% hydration) Loose Dough | flour inside 155g | water inside 155g | use 345g fresh flour | use 245g Warm Water | soda 1.6g |
On-Bench Hydration & Fermentation Adjuster
Modify base flour mass, levain inoculation, or ambient kitchen temperature below to recalculate from this -150g baseline.
Preventing Gummy Texture When Using a Large 300g Sourdough Discard Dose in Same-Day Sourdough Discard Focaccia
The acid load arrives with the flour, not the water. Roughly 6 grams of lactic and acetic acid ride along inside 300 g of discard, and that is exactly why 1.5g of sodium bicarbonate belongs in the formula: it converts those acids into their much milder sodium salts while releasing the CO2 that lifts the batter at 450°F (230°C) for 22–25 min.
Do not add baking powder on top of the soda without adjusting it. The 1.5g of bicarbonate already supplies lift through gas production, so halving the baking powder in the original same-day sourdough leftover starter focaccia recipe prevents a metallic, soapy crumb.
How to Mix Same-Day Sourdough Discard Focaccia with 300g Sourdough Discard
- Reduce the Leavener: Because 300g of discard already carries 6g of acid, halve the baking powder in the original same-day sourdough discard focaccia recipe and add 1.5g of bicarbonate instead.
- Combine Dry Ingredients (350g): Sift 350g of flour with the reduced baking powder and any sugar or cocoa the recipe calls for.
- Mix Wet Ingredients (300g Discard): Combine 300g of discard with 250g of warm water, the egg or butter, and any vanilla.
- Bring It Together and Bake (450°F (230°C) for 22–25 min): Fold wet into dry, rest ten minutes, then cook at 450°F (230°C) for 22–25 min until the top is deeply coloured.
Common Scaling & Troubleshooting Questions (-150g)
Why is my same-day sourdough discard focaccia spreading more than the original recipe after adding discard?
Almost always because the 150g of water inside 300 g of discard was not deducted. Correct the liquid to 250g, and brown the butter or add an extra fat to lock the remaining moisture.
Can I use a 50% hydration discard instead of 100% in this same-day sourdough discard focaccia recipe?
Yes, but the deductions change completely: at 50% hydration, 300g of discard carries 200g of flour instead of 150g, so you would deduct that much more flour and correspondingly less liquid.
Why did my same-day sourdough discard focaccia turn out gummy when I used 300g of discard?
Two usual causes: you did not deduct the 150g of water the discard carries, or you added the 300g of discard to a batch already at full hydration. Correcting the water to 250g usually fixes it.