Caramelized Red Onion Tart

Preparing the Crust In a large mixing bowl, combine the flour and salt. Add the cold butter cubes and use a pastry cutter to cut the butter into the flour until the mixture resembles coarse crumbs.

2.Add ice water, 1 tablespoon at a time, and mix until the dough comes together. Shape the dough into a disk, wrap it in plastic wrap, and refrigerate for 30 minutes.

Caramelizing the Onions Heat the olive oil in a large skillet over medium heat. Add the thinly sliced red onions and cook, stirring occasionally, until they begin to caramelize and turn golden brown, about 20-25 minutes.

Creating the Filling In a bowl, whisk together the eggs, heavy cream, balsamic vinegar, sugar, salt, and black pepper. Stir in the grated Gruyère cheese and fresh thyme leaves.

5.Preheat the oven to 375°F (190°C).