San Francisco Sourdough Bread
The bread that defined San Francisco. 150 years and a still-famous sourness.
Why this dish belongs to California
San Francisco sourdough is famous for a reason: the local Lactobacillus strains (specifically L. sanfranciscensis) that ferment alongside the wild yeast give the bread a distinctive tang that's hard to replicate elsewhere. The tradition came with French and German bakers during the Gold Rush of 1849; Boudin Bakery (still operating, started in 1849) maintains the original SF starter as living history. The technique requires a sourdough starter (a fermented mix of flour and water that captures wild yeast and bacteria), a slow cold-bulk fermentation, and high-heat baking with steam to develop the crackly crust and open crumb. The home version takes 24 hours total but only 30 minutes of active work. The signature loaf is a round boule with deep slashes, a glossy crackly crust, and a tender open interior. Pair with butter, with sandwich fillings, with soup. Sourdough culture is a SF institution — bakeries like Tartine and Acme run nation-defining sourdough programs, and home sourdough exploded in popularity during 2020 lockdowns.
Method · 14 steps
- 1
Confirm starter is active: it should have doubled within 6-8 hours of feeding, with bubbles on top and float-test passing (drop a teaspoon in water; it should float).
- 2
Mix the dough: in a large bowl, whisk warm water and starter until dissolved. Add flour and salt. Stir with a spatula or hand until no dry flour remains. Cover and rest 30 minutes (autolyse).
- 3
Stretch and fold: with wet hands, lift one edge of the dough, stretch it up, fold over the center. Rotate the bowl 90° and repeat. Do 4 stretches total. Cover and rest 30 minutes.
- 4
Repeat the stretch-and-fold sets every 30 minutes for the next 2.5 hours (5 sets total). The dough should become smooth, elastic, and visibly stronger with each fold.
- 5
Bulk ferment: leave covered at 75-78°F for 4-6 hours (depends on room temperature). Dough is done bulk when it has risen 50% and you see bubbles on the surface.
- 6
Pre-shape: turn dough onto an unfloured counter. Use a bench scraper to gently round it into a tight ball. Rest 20 minutes uncovered.
- 7
Final shape: dust the counter with flour. Flip the dough seam-side-down. Pull the edges in toward the center, building tension. Flip seam-side-up.
- 8
Place in a banneton (rattan basket) heavily dusted with rice flour, seam-side-up. Cover with a kitchen towel.
- 9
Cold retard: refrigerate 12–24 hours. The slow cold ferment builds flavor.
- 10
Bake: place a Dutch oven (with lid) inside the oven and preheat to 500°F for 1 hour. The pot must be screaming hot.
- 11
Carefully remove the hot Dutch oven. Flip dough out of the banneton onto parchment paper (seam-side-down now). Score the top with a sharp blade — one bold cross or curve. Don't be timid.
- 12
Use the parchment to lower the dough into the hot Dutch oven. Cover with the lid. Reduce oven to 450°F. Bake covered 25 minutes.
- 13
Remove the lid. Bake another 18-22 minutes uncovered until the crust is deeply browned (almost burnt-looking; that's correct).
- 14
Remove and cool on a wire rack at least 1 hour before slicing. Cutting too early = gummy interior.
Chef's notes
- →Sourdough starter is half the equation. Feed it 6-8 hours before mixing the dough. A weak/sluggish starter = flat bread.
- →Rice flour is for the banneton because it doesn't absorb moisture and won't stick. AP flour or bread flour stick.
- →The cold retard (12-24 hour fridge rest) is what builds flavor. Same-day sourdough is bread-shaped sourdough; cold-retarded is real flavor.
- →Score deeply with a sharp blade or razor. Shallow cuts close back up; deep cuts give the dramatic 'ear' that opens during baking.
- →Don't slice the bread for at least 1 hour — it's still cooking on the inside as it cools. Cutting hot bread = gummy texture.
Storage
Sourdough keeps 3-4 days at room temperature in a paper bag. Freezes 3 months wrapped in plastic + foil. Slice before freezing for grab-and-go.
Frequently asked
- How do I make a sourdough starter from scratch?
- Mix 50g flour + 50g water, let sit at room temp for 5-7 days, feeding daily with fresh flour and water. By day 7 you should have a bubbly active starter. Many sourdough cookbooks (Tartine, Forkish) walk you through. Or buy a pre-made starter online — works the same.
- Why does San Francisco sourdough taste different?
- Lactobacillus sanfranciscensis is the local bacteria strain that gives SF sourdough its tang. The strain is harder to cultivate elsewhere. You can move a SF starter and it'll lose some character within weeks as local microbes take over.
- Can I bake sourdough without a Dutch oven?
- Yes — bake on a baking stone with a tray of water below for steam. Less reliable than Dutch oven (steam escapes the oven), but workable. Dutch oven is the easiest path to bakery-quality crust at home.
- How long does sourdough take from start to bake?
- About 24-30 hours total. Active work is maybe 1 hour spread out; the rest is fermentation and resting. Plan: starter feed Friday morning, mix dough Friday afternoon, bulk ferment Friday evening, shape and refrigerate Friday night, bake Saturday morning.
- What's the difference between sourdough and yeast bread?
- Sourdough uses wild yeast and bacteria from a starter — slower, more complex flavor. Yeast bread uses commercial dry yeast — faster, more predictable, milder flavor. Sourdough is harder but tastes better; yeast bread is easier and consistent.
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