Subrot Alsacien

The subrot (also surbrot or sunbrot, from the Alsatian dialect meaning ‘sour bread’) is Alsace’s distinctive sourdough: a large, dense, long-keeping loaf made from a blend of wheat and rye flours leavened exclusively with a rye-based levain, producing a bread of extraordinary depth, slight acidity, and a dark, thick crust that echoes the region’s Germanic bread traditions while remaining distinctly French. The flour blend typically combines 60-70% Type 65 wheat flour with 30-40% rye flour (Type 130 or Type 170), creating a balance between wheat’s gluten structure and rye’s moisture, flavour, and distinctive chew. The levain is maintained with rye flour at 80-100% hydration, producing an actively sour culture rich in both lactic and acetic acids that gives the bread its name (‘sour’). Hydration of the final dough is 68-72%, and mixing is moderate (the rye component limits gluten development). Caraway seeds (1-2% of flour weight) are a traditional addition that identifies Alsatian bread as distinctly as cumin identifies Indian naan. Bulk fermentation is 2-3 hours with folds, or retarded overnight. The dough is shaped into a large round (boule of 1-1.5kg) or an elongated oval, often with a distinctive pattern of parallel slashes or a lattice scored into the top. Proofing is 60-90 minutes. Baking at 230°C with steam for 10-15 minutes, then 200°C for 30-40 minutes for a 1kg loaf. The finished subrot has a dark, thick, cracking crust, a dense but moist crumb with the characteristic grey-beige colour of wheat-rye blends, and a flavour profile that balances wheat’s nuttiness with rye’s earthiness, the levain’s tang, and the anise warmth of caraway. Like all rye-containing breads, it benefits from 24 hours’ rest before cutting and keeps well for a week. The subrot is the essential bread of choucroute garnie, the butter-slathered accompaniment to Munster cheese, and the base for open-faced sandwiches of smoked pork and pickled vegetables.