Your not a true so californian if In and Out is not on the top of your list.

In and out
Chick-fil-A ( loved it in Arkansas and now there here in calif)
Braums (both ice cream and their burgers)
Albertos
SONIC! ( give me a cherry lime-aide or a sweatheart shake anyday!)
We only have one in so calif and that is by the park ( disneyland)

Tom's burgers ( calif thing)