Home Bread Baking Guide

Understanding the Starter

A sourdough starter is a symbiotic culture of wild yeast and lactic acid bacteria cultivated from the natural environment and the flour itself. Maintaining a starter involves discarding a portion and feeding it fresh flour and water at regular intervals. A healthy starter will roughly double in volume a few hours after feeding, displaying a web-like structure of bubbles and emitting a pleasant, slightly sour, fruity aroma.

The Bulk Fermentation Phase

Unlike commercial yeast, sourdough ferments slowly. The bulk fermentation phase is the long period after mixing where the dough rests at room temperature. During this time, the baker typically performs a series of "stretches and folds" to build strength in the dough without knocking out the accumulating gases. Judging the end of bulk fermentation is critical and relies on observation: the dough should look aerated, feel jiggly, and have increased in volume significantly.

Shaping and Retarding

Once bulk fermentation is complete, the dough is gently shaped to create a tight outer skin. Most sourdough bakers then place the shaped dough into a floured banneton (proofing basket) and retard the dough by placing it in the refrigerator overnight. This cold proof slows down the yeast activity significantly while the bacteria continue to produce acids, resulting in a much deeper flavor profile and a dough that is easier to score.

Scoring and Baking

Scoring the dough with a sharp blade just before baking is not merely decorative; it creates intentional weak points in the crust, guiding the dough's expansion (oven spring). Sourdough requires an intensely hot environment with high moisture. Baking inside a preheated Dutch oven traps the moisture escaping from the dough, keeping the crust soft enough to expand rapidly before eventually removing the lid to allow the crust to caramelize and harden.