
Starter paste, also known as sourdough starter or levain, is a live culture of wild yeast and lactic acid bacteria. It's the key ingredient in sourdough bread, providing a tangy flavor and unique texture. The paste typically appears as a thick, bubbly mixture with a slightly sour aroma. Its color can range from off-white to beige. The sourdough starter's activity determines the final bread's rise and overall taste, making it a crucial element for authentic sourdough.
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Sourdough starter paste needs consistent care. For short-term storage (up to a week), keep it in the refrigerator in a loosely covered container. Feed it at room temperature every 1-2 weeks, or weekly if at room temperature. For longer storage (months), store the starter in the refrigerator. Feed it 1-2 days before use. You can also freeze starter in an airtight container, it will last for months. To use, thaw in the refrigerator and feed to revive it.