A loose definition of San Francisco foods...whether it's food that's stereotypically associated with the area (ahem) or food that people who live in SF really love (ACME bread), it should be listed here.
If there's a San Francisco food that you don't see listed here but that should be here, make sure there's an entry for it (create it if one doesn't exist - even a little info is fine!) and tag it "food". It will then automatically show up in the list below.