Use the best possible summer tomatoes to make this signature tomato tart from the south of France. Juicy tomato slices, sprinkled with herbes de Provence and Parmesan cheese, caramelize atop a layer of Dijon mustard spread over a flaky, buttery puff pastry crust. After a final sprinkling of fresh herbs and a drizzle of olive oil, this savory French tart is ready to enjoy with chilled rose wine for a real summer delight. Get the recipe for Chef John's Tomato Tart.