Sourdough Starter
A live or freeze-dried culture of wild yeast and bacteria used to leaven sourdough bread, sold as an ingredient for home baking.
Estimated value as of 2026 · Source: King Arthur Baking Company Classic Fresh Sourdough Starter
Fun Fact
Many commercial starters trace their lineage back over 100 years, like the one from Sunrise Flour Mill originating in Italy.
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