Sourdough Tortilla at 68–72°F

Why the timing shifts

Most home kitchens — typical year-round room temperature. Ferment slightly longer than 76°F baseline. Recipe times generally work as written with minor extensions (+20%). Good balance of schedule manageability and flavor development. Most Hamelman and Tartine formulas are written assuming this range.

Technique for Sourdough Tortilla

Mix all ingredients (fat cut in like pie dough). 30 min rest only. Divide into 60g balls, roll thin (about 7 inches). Cook on dry cast-iron skillet at medium-high heat (400°F) for 30-45 sec per side until lightly browned with some bubbles.

Why 68–72°F changes your timing

Sourdough is a living culture, and its yeast and bacteria speed up as it warms. Across the useful baking window (roughly 50–95°F) the rate follows the classic Q₁₀ relationship — fermentation runs about two to three times faster for every ~15–18°F of warming. At 68–72°F the net effect is a 1.20× bulk and 1.20× proof multiplier versus the 76°F bakery baseline, so every stage runs slower. That single number is why a formula's printed times only hold at the temperature they were written for — move the dough 10 degrees and the clock is wrong.

Worked timing at 68–72°F

Sourdough Tortilla baselines from the recipe, multiplied by this range's bulk (1.20×) and proof (1.20×) factors. Treat these as a floor to start checking, not a finish line.

What to watch for at 68–72°F

This range sits close to the 76°F bakery baseline, so printed recipe times apply almost directly — the usual bulk-and-proof cues hold with only minor adjustment. Still judge the dough by rise and feel rather than the clock; every kitchen has cold and warm spots.

How to adjust your formula at 68–72°F

Keep your usual 15–20% levain — the modest 1.20× shift is best handled by watching the dough rather than re-formulating.

To land the dough in this range even when the room swings, use the desired-dough-temperature (DDT) method: dough temperature ≈ (flour temp + room temp + water temp + friction factor) ÷ 4. Solve for the water temperature you need — in a cool kitchen use warmer water; in a hot one, cool or even iced water — so the dough itself, not just the air, sits at your target.

Telling doneness by feel, not the clock

The times above are a guide; the dough is the real timer. Bulk is done when the mass has risen 50–75%, looks domed and bubbly, and jiggles like set custard when you shake the container — an aliquot jar (a small sample in a straight-sided container) makes the rise easy to read. The final proof is ready when a floured poke springs back slowly and only partway. These cues are identical at every temperature; only when they arrive changes — at 68–72°F, sooner or later by the 1.20× factor above.

Sourdough Tortilla at 68–72°F — FAQ

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