01 - Set the oven to 375°F (190°C).
02 - Combine flour and salt in a bowl. Incorporate cold butter until mixture resembles coarse crumbs. Add ice water one tablespoon at a time until dough forms. Shape into a disk, wrap tightly, and refrigerate for 20 minutes.
03 - On a lightly floured surface, roll dough to fit a 9-inch tart pan. Press the dough into the pan and trim any excess. Piercing the base with a fork ensures even baking.
04 - Line the pastry with parchment paper and fill with pie weights or dried beans. Bake for 15 minutes, then remove the weights and bake an additional 5 minutes. Set aside to cool slightly.
05 - Heat olive oil in a skillet over medium heat. Sauté the onion, zucchini, and bell pepper for 5 to 7 minutes until tender. Remove from heat and allow to cool slightly.
06 - Whisk eggs, heavy cream, salt, and black pepper together. Mix in half the cheese and herbs.
07 - Arrange sautéed vegetables and cherry tomatoes evenly over the pre-baked crust. Pour the egg custard mixture on top. Sprinkle with remaining cheese and herbs for finishing.
08 - Bake in the oven for 25 to 30 minutes until the filling is set and the surface is golden brown. Let cool briefly before cutting and serving.