Raisins (Rosinen) — How to Use in Sourdough

If fermentation seems faster than normal after adding raisins, the likely cause is added sugars or retained soaking liquid. Reduce future yeast activity by lowering ambient temperature or retarding in the fridge. If raisins sink and clump at the loaf bottom, fold them in later or coat them with flour before incorporation to improve suspension [1][2].

1) Weigh all ingredients on a kitchen scale — inclusions change dough mass and water balance; precision prevents surprises [1].

2) For aromatic complexity, soak raisins in a small amount of strong tea or rum, then pat dry; reserve liquid to adjust dough water if used [2].

3) If you want raisins throughout the crumb without big clumps, chop larger raisins or use golden raisins; distribute during gentle folds [1].

4) To avoid sticky pockets, dust raisins lightly with a small amount of flour before adding — this reduces local stickiness and helps distribution [2].

5) Use a glass jar for starter or a clear container to keep any raisin-containing preferments visible and controllable if you experiment with raisin levains [1].

6) If dough becomes overly slack after adding soaked raisins, perform a short cold rest (30–60 minutes in the fridge) to firm the dough and finish shaping later; cool temperatures slow yeast activity and help with handling [1][2].

Raisins bring simple sugars (fructose, glucose) and organic acids that yeast and bacteria can metabolize differently than flour carbohydrates. Small amounts of raisin sugars can accelerate yeast activity locally, but because raisins are a relatively small fraction of total dough mass (commonly 10–25% by flour weight), they rarely cause runaway fermentation if handled properly [1]. Raisin skins also contribute tannins and phenolic compounds that subtly affect flavor and crust color [2].

A practical range is 10–20% raisins by weight relative to flour. For example, with 500 g flour, use 50–100 g raisins. Because raisins are hygroscopic, account for their water content: plump raisins will release liquid into the dough during fermentation and soften the crumb near inclusions. If you want a drier crumb, reduce dough water by about 5–10% (25–50 g water for a 500 g flour dough) when using 20% raisins. Conversely, if you desire a more open crumb and expect raisins to rehydrate fully, keep your intended baker's hydration and compensate by soaking raisins separately (see next). These adjustments follow standard inclusion-handling practices taught in long-form sourdough resources [1][2].

Soaking raisins has three useful effects: (1) it equalizes their internal moisture so they don't leach sugar unpredictably during bulk fermentation; (2) it rehydrates wrinkled fruit for better mouthfeel; (3) it allows optional flavor infusion (tea, rum, or spiced syrup). Soak in warm water (30–40°C) for 20–60 minutes, or longer at room temperature for gentle rehydration. Drain and pat dry — reserve a tablespoon of the soaking liquid if you want to boost fermentation flavor or incorporate it into the dough water. Avoid adding large volumes of soaking liquid to the dough unless you subtract that volume from the recipe's water to maintain target hydration [1][2].

Add raisins late in bulk fermentation during the last set of stretch-and-folds or during bench folding before shaping. This timing minimizes mechanical damage and ensures even distribution without overstimulating early fermentation. Gently incorporate raisins by laying them on top of the dough and folding them in with a dough scraper/bench knife or by performing one or two gentle coil folds. If you prefer more even distribution, divide the dough, sprinkle raisins, and recombine gently. These methods are recommended by experienced bakers to protect dough structure while achieving even inclusions [1][2].