CA Health & Safety Code Section 111205

(a)

If imitation hamburger is sold or served in restaurant a list of ingredients thereof shall appear on the menu, or, if there is no menu, the information shall be posted as state department shall by regulations require. No list of ingredients, however, shall be required for imitation hamburger that contains not more than 10 percent added protein and water, and that does not contain other binders or extenders.

(b)

No restaurant shall use the terms “hamburger,” “burger,” or any other cognate thereof in any advertisement, or menu to refer to any imitation hamburger. A restaurant selling or serving imitation hamburger may refer to the product as imitation hamburger or by any other term that accurately informs the customer of the nature of the food product that he or she is sold or served.