This Heirloom Tomato Tart is a delightful summer dish that showcases the vibrant flavors of heirloom tomatoes. The tart features a flaky, buttery crust filled with a creamy ricotta and Parmesan cheese mixture. Topped with slices of colorful heirloom tomatoes and fresh basil leaves, this tart is a feast for the eyes and the taste buds. It's perfect for a light lunch or as an appetizer for a summer gathering.