When Nancy Silverton brought a jar of sourdough starter from New York's Sign of the Dove back home to Los Angeles in the 1980s, she had no idea that she would use it to grow an empire. On the 30th anniversary of La Brea Bakery, the chef, author, and entrepreneur reflects on the evolution of American restaurants, how she learned to trust her instincts, and why 23andMe should track her bread's family tree.

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