Tomato Pesto Tarts with Optional Prosciutto Ingredients 1 sheet store-bought frozen puff pastry, thawed at room temperature for about 30 minutes ½ cup of your favorite pesto (I used a homemade basil and sunflower seed pesto; recipe below) 2 medium tomatoes, sliced (about 1 pound) (the more flavorful the better!) ¼ cup shredded Parmesan