Depends a bit..
If it could be in every variety that the food type comes in - thin, thick, all sorts of different toppings, gas vs woodfire, etc - then I'd go with Pizza.
If it was just one variety, then I'd go with fresh squeezed Orange Juice (light on the pulp but not pulp-less).
If drinks weren't included, then I'd go with chopped fresh tomatoes. Cos never having to cut them up or run out of them again would be kinda rocking.