Artisan Sourdough Recipe Matrix

The classic Tartine Country Loaf formula follows Chad Robertson's iconic baker's percentages: 90% bread flour, 10% whole wheat flour, 75% apparent hydration (yielding 77.8% true total hydration when starter water is accounted for), 20% young active levain, and 2.0% fine sea salt. Fermented at 78°F–80°F (26°C) for 3.5 to 4 hours with 4 sets of gentle turns, followed by a 12–16 hour cold retard at 38°F (3°C) and a 450°F (232°C) Dutch oven bake.

Artisan sourdough focaccia is crafted at 82% apparent hydration (reaching 84.5% true total hydration), with 85% high-protein bread flour, 15% whole wheat or semolina, 20% active sourdough starter, 2.2% fine sea salt, and 5% extra virgin olive oil in the dough mix. Proved for 4 hours at room temperature followed by an optional overnight cold retard or 3-hour warm pan proof until billowing with gas, then dimpled with wet-oiled fingers and baked at 425°F–450°F (220°C–232°C) in an oiled pan for 25–30 minutes.

Authentic San Francisco sourdough achieves its characteristic sour tang through a 67% apparent hydration formula (70.5% true total hydration) with 95% bread flour, 5% dark rye (which nourishes Lactobacillus sanfranciscensis bacteria), 15% mature acidic starter, and 2.0% salt. The key to the tangy flavor is a prolonged 24 to 36-hour cold retard at 36°F–38°F (2°C–3°C), which favors bacterial acetic acid synthesis over yeast ethanol production, baked in a cast-iron combo cooker at 450°F (232°C) with dense steam.