Preheat oven to 400°F (200°C). Lightly grease a baking sheet with a parchment paper.
Gently unfold the thawed puff pastry sheet on the prepared baking sheet. If it’s a large rectangle, you can leave it as is. If it’s folded, gently unfold it.
If desired, create a slight border around the edge of the puff pastry (about 1 inch) by scoring a line with a knife, being careful not to cut all the way through. This will help the edges puff up nicely. You can also gently crimp the edges with a fork for a decorative look.
Prick the bottom of the pastry all over with a fork (this prevents it from puffing up too much).
Brush the edges of the pastry with the beaten egg wash.
Bake the crust for 15-20 minutes, or until lightly golden. Remove from the oven and let it cool slightly while you prepare the filling.
In a medium bowl, combine the ricotta cheese, Parmesan cheese, chives, parsley, thyme, minced garlic, salt, pepper, and red pepper flakes (if using). Stir everything together until well combined and creamy.
Prepare the vegetable flowers: Cherry Tomatoes: Wash and halve the cherry tomatoes lengthwise.Asparagus: Snap off the tough ends of the asparagus. If the spears are thick, you can slice them lengthwise into thinner ribbons using a vegetable peeler or a sharp knife (this will make them more pliable for arranging). If they are thin, you can use them whole or cut them into shorter lengths (about 2-3 inches) depending on your desired “petal” size.
In a bowl, toss the prepared cherry tomatoes and asparagus with 1 tablespoon of olive oil, salt, and pepper.
Spread the herbed ricotta mixture evenly over the pre-baked tart crust.
Arrange the flowers to your liking.
Carefully place the assembled tart back in the preheated oven. Bake for another 20-25 minutes, or until the crust is deeply golden brown and the vegetables are tender-crisp. The ricotta filling should be heated through and slightly set.
Let the tart cool in the pan for a few minutes before carefully removing it from the tart pan. Serve warm or at room temperature. Garnish with extra fresh herbs, if desired. A drizzle of balsamic glaze after baking can also add a touch of sweetness and visual appeal.