Tomatoes are a vegetable in Papa's Saladeria, Papa's Nachoria, Papa's Sandwicheria, Papa's Hamburgeria. In Papa's Nachoria, they are a place able and a pour able veggie. They are unlocked from the start in all the games.
Tomato is a standard topping that customers can order in Papa's Hamburgeria. The topping is unlocked from the start of the game.