
Levain, also known as sourdough starter, is a fermented mixture of flour and water that serves as a natural leavening agent in bread baking. It has a tangy, slightly sour flavor profile and a bubbly, airy texture due to the active yeast and bacteria cultures. Levain is typically pale beige in color and can vary in consistency from thick and dough-like to more liquid, depending on hydration levels. This ingredient is prized for its ability to create artisanal breads with complex flavors, chewy textures, and crisp crusts, making it a staple in traditional and modern baking recipes.
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Levain, or sourdough starter, should be stored in a clean, airtight container. If you plan to use it daily, keep it at room temperature and feed it with equal parts flour and water every 12-24 hours. For less frequent use, refrigerate it and feed it once a week to maintain its activity. Always discard a portion before feeding to prevent overflow and maintain balance. If freezing, ensure it's well-fed and store it in a freezer-safe container for up to a few months.