Cal. HSC § 111955

“Food processing establishment,” as used in this chapter, shall mean any room, building, or place or portion thereof, maintained, used, or operated for the purpose of commercially storing, packaging, making, cooking, mixing, processing, bottling, canning, packing, slaughtering, or otherwise preparing or handling food except restaurants. “Food processing establishment” shall not include a cottage food operation that is registered or has a permit pursuant to Section 114365 or a microenterprise home kitchen, as defined in Section 113825.