Food can and is cooked at the cart or truck. Though there may be a regulation regarding prep, no idea. I used to visit a burger truck every Friday off Water St

Food can and is cooked at the cart or truck. Though there may be a regulation regarding prep, no idea. I used to visit a burger truck every Friday off Water St in down town, Frites n Meats. They cooked the burgers and fries on the spot. Every other food truck I've patronized also cooked and served fresh food. The carts simply have no prep space so they prep the food at a kitchen. I frequent one halal cart here in Queens, Shah's, and have many times witnessed the delivery van pull up and drop off food. I've also seen them cut open a vacuum sealed bag of raw marinated meat, pour it over the grill and start cooking. Delicious.