The sourdough bread, believed to be impossible to produce anywhere else in the world, became one of the city’s hottest commodities. It was so singular that the yeast responsible for the flavor was named after the city: Lactobacillus sanfranciscensis.

The sourdough bread, believed to be impossible to produce anywhere else in the world, became one of the city’s hottest commodities. It was so singular that the yeast responsible for the flavor was named after the city: Lactobacillus sanfranciscensis.