Cioppino originated in San Francisco as a soup made from whatever seafood was leftover, combined with tomatoes, wine and herbs. Clam chowder contains clams along with potatoes, onions and sometimes bacon. Dungeness crab season runs from November to December and is a major part of San Francisco's seafood culture. Several other iconic San Francisco foods include fortune cookies, Hangtown fry (omelette with bacon and oysters), and sourdough bread.