Pure-sourdough French wheat bread — 100% naturally leavened, no commercial yeast. Milder than San Francisco style, more lactic than acetic.
The defining law: the 1993 décret pain (Decree No. 93-1074) requires that bread sold as pain au levain in France leaven exclusively with sourdough, with pH ≤ 4.3 and ≥ 900 ppm acetic acid in the dry matter. The decree was lobbied for by artisans against industrial 'sourdough flavoring' shortcuts.
Eric Kayser's monolevain method (1990s, Paris) uses a liquid 100%-hydration starter refreshed every 8 hours; his recipe runs 70% hydration with a 16h retard. Kayser's bakery has 25 Paris outlets and exports the system to 27 countries.
Caramel-blonde crust, tighter crumb than pain de campagne, smell of yogurt rather than vinegar. Lactic-sweet first, mild tang at swallow, no sharp acetic punch. Wheat-forward — this is the loaf to butter, not toast.
Wheat flour at 75-78°F bulk favors lactic acid over acetic — temperature is the lever. Drop bulk to 65°F or push retard to 50°F+ and acetic acid climbs, the loaf turns sharp and 'San Francisco.' French levain stays warmer on purpose.
Variations
Monolevain (Kayser, liquid starter, refreshed often); Levain dur (stiff 50% hydration starter, sharper flavor); Pain au levain de seigle (rye-fed levain on a wheat dough); Apollonia Poilâne's miche-form pain au levain (1.9 kg round, the in-house benchmark).
On the Palate
Where Pain au Levain sits in the French flavor cloud
Ingredients
Serves 8How it's made
6 steps · 10 min active + 1 day 2 hours 45 min waiting
- 1300 min
Build active levain: 50 g starter + 100 g flour + 100 g water; rest 4–6 hr.
Watch outThe levain's ready when it's domed, bubbly, and floats in water — if it's flat or smells sharp-sour, give it more time.
- 260 min
Mix 800 g bread flour + 560 ml water; autolyse 1 hr.
- 310 min
Add 200 g levain + 18 g salt; knead briefly.
- 4300 min
Bulk ferment 4–6 hr with folds every 30 min.
Watch outBulk's done when the dough is puffy and jiggly with a domed top and bubbles at the edges — go by the look, not just the clock.
- 5900 min
Shape boule; cold-proof 12–18 hr.
- 645 min
Bake 250 °C Dutch oven covered 20 min, uncovered 200 °C 25 min.
Watch outLid on traps the steam for a big oven-spring; lid off, take it to a deep chestnut-brown crust — pale means underbaked.
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