Tarte Aux Moutarde, also known as French Tomato and Mustard Pie, is a savory and flavorful dish that combines the sweetness of tomatoes with the tanginess of mustard. This traditional French recipe is a perfect appetizer or light lunch option. The pie crust is filled with a mixture of tomatoes, mustard, herbs, and cheese, creating a delicious and satisfying flavor combination. It's a great way to showcase the fresh flavors of summer tomatoes.