In Vermont, you are allowed to cook BBQ in your home kitchen for sale at farmer's markets as long as your kitchen water supply has been tested and is safe. You have to maintain the heat so are not allowed to cool it down then reheat.
I found this out by calling the health department.
I don't know what state you are in, but it may be worth making a call to your health department.
Jim - Another transplanted Texan
Former KCBS CBJ
Large and Medium Big Green Eggs , Black 18.5" WSM, Blue Weber Performer - Stainless, Green Weber OTG Kettle , Brinkmann SnP Pro, and a Stainless UDS. One retired Portable Kitchen grill.
Red Thermapen, Maverick ET-732, EdgePro Apex Sharpener.
Avatar is the original 1951 Weber Kettle