At the initial levels of the game, Food Truck is unlocked and arrives at your Backyard bringing in Dishes, Vegetables, Fruits, and Chef Tools that you can instantly purchase. There are other Chefs who would be on the lookout for items from the Food Truck. So keep a watch on items you need and purchase it quickly before someone else takes it!
The Food Truck remains in your Backyard for 3 hours before heading out to bring out the next batch of the fresh produce! If you prefer, you can utilize in-game green cash to skip this timer and acquire new items on the Food Truck.