Vegan Tomato Garlic Backyard Tart

Select mixed-color heirloom tomatoes to make this tomato tart from the Vegan BBQ cookbook look completely show-stopping. The freshness of this dish makes it a wonderful accompaniment to different grilled meals. 

1 (11-ounce) sheet of readymade puff pastry
1 garlic clove
4 massive heirloom tomatoes, sliced
6 small heirloom tomatoes, sliced
1 tablespoon olive oil
¼ cup finely chopped contemporary dill 
6 nasturtium leaves and flowers 
¼ teaspoon salt 
¼ teaspoon black pepper