Topic · Baking

Sourdough

Bread leavened by a culture of wild yeast and lactic acid bacteria rather than commercial baker’s yeast.

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In this chapter

  • Baking the loaf — The oven stage, when heat sets crust and crumb, gelatinizes starch, and turns a proofed dough into bread.
  • Bulk fermentation — The first rise of mixed dough, when yeast and bacteria produce gas, acid, and flavor before the loaf is shaped.
  • Dough development — The gaining of dough strength and extensibility through mixing, rest, and folds as gluten networks organize.
  • Final proof — The last rise of a shaped loaf, when the dough relaxes and gains the gas it will carry into the oven.
  • Levain — A preferment built from starter, flour, and water for a particular dough, mixed and fermented on a schedule.
  • Mixing — Combining flour, water, salt, and leaven so that gluten can form and fermentation can begin evenly.
  • San Francisco sourdough — A civic bread story, a commercial bakery style, and a laboratory isolation — three layers that are easy to mash into one myth.
  • Scoring — Cutting the surface of a proofed loaf so that oven spring opens along an intended line rather than at a random burst.
  • Shaping — Organizing fermented dough into a taut loaf so that it can rise upward in the proof and the oven.
  • Sourdough starter — A maintained culture of flour and water that hosts wild yeast and lactic acid bacteria for leavening bread.
  • Sourdough troubleshooting — A map from common loaf faults — dense crumb, weak rise, harsh sourness — back to starter, fermentation, strength, and heat.

Appears in Bread books: a working library · Previous: Preferment · Next: Whole-wheat bread

Sourdough is a way of raising dough with a living culture — flour and water that have captured Wild yeast and Lactic acid bacteria — instead of packaged baker’s yeast.

The culture (the starter) inoculates the dough. During Fermentation the microbes make gas, acids, and aroma. Flour choice matters: protein, ash, and enzyme activity in Wheat flour change how that fermentation feels 1.

San Francisco’s reputation for this bread is real history and real microbiology, and it is also a magnet for folklore. That argument has its own page: San Francisco sourdough. A working bakery in the city is Tartine Bakery. For a teaching loaf with baker’s percentages, see Country loaf (teaching formula).

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Ingredient

Place

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Sources and further reading

Cited in this article

  • The Taste of Bread — Raymond Calvel. Aspen Publishers. 2001. ISBN 978-0-8342-1646-4 — English edition of Calvel's technical account of French bread. The link is a WorldCat catalog record for the print edition; it is not a public full-text copy.

Updated 2026-08-25. gg:topic:sourdough · CC BY 4.0

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Gourmet Gastronomer. "Sourdough." Updated 2026-08-25. https://gourmetgastronomer.com/baking/sourdough/ gg:topic:sourdough.

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Gourmet Gastronomer. "Sourdough." Gourmet Gastronomer. Updated August 25, 2026. https://gourmetgastronomer.com/baking/sourdough/.

APA

Gourmet Gastronomer. (2026, August 25). Sourdough. https://gourmetgastronomer.com/baking/sourdough/

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