Cal. Health & Safety Code § 114368.2

(a) Compact mobile food operations shall conduct only limited food preparation, as defined in Section 113818. Notwithstanding any other provision of this part, a compact mobile food operation, as defined in subdivision (c) of Section 113831, may display or sell food outdoors, if all of the following conditions are satisfied:
1. (1) Overhead protection are provided above all food display areas.
2. (2) Food items from the outdoor display are stored consistent with this chapter at all times other than during business hours.
3. (3) Outdoor displays comply with Section 113980 and have been approved by the enforcement agency if the compact mobile food operation is required to obtain a permit.
(b) A compact mobile food operation shall not sell food other than nonpotentially hazardous prepackaged food or whole produce, or conduct any food preparation, unless it meets the applicable operational requirements of this chapter, including applicable requirements for integral equipment, handwashing, and restroom access.
(c) Equipment that is required to be integral to a compact mobile food operation shall either be permanently attached to the primary unit or securely fastened to the primary unit by means that would prevent unintentional removal. Equipment may be considered integral despite being portable or otherwise removable for cleaning, maintenance, or as part of its regular function.
(d) A compact mobile food operation operating from an individual shall not conduct any food preparation or sell foods other than nonpotentially hazardous prepackaged food or whole produce.