Tomato tarts are considered a summer staple in the French countryside, and you will know why when you bite into this mouth-watering tart. Buttery and flaky puff pastry is the base for spicy mustard, creamy Gruyère, and juicy tomatoes. It's the perfect summer meal.
Preheat oven to 425 degrees F. Lightly roll out the puff pastry on a sheet of parchment paper. Transfer dough on parchment paper to a baking sheet. Using a knife, score the puff pastry about 1 inch from the edge. Prick the center of the dough all over with a fork.