Basil Leaves are an ingredient used in Papa Louie's restaurant time-management games.
In Papa's Pastaria, They are a holiday-exclusive topping during Christmas holiday. It is with Roy on Rank 43.
In Pizzeria To Go!, They are one of twenty-six toppings. It is unlocked with Marty on Rank 15. The Badge "Green Garnish" is earned when a player serves 30 orders with Basil Leaves.
In Pizzeria HD, they are one of the standard toppings in the game. It's unlocked with Foodini on Rank 30.