Tomato Tart with Caramelized Onions

We make this classic tart from The Pioneer Woman every year.

Ingredients:
4 tablespoons butter
2 large sweet onions, peeled, halved and sliced thin
2 store-bought pie crusts (or 1 good-sized homemade crust)
1½ cups grated Fontina cheese
¼ cup grated Parmesan cheese
¼ cup grated Gruyère cheese
3 cups cherry tomatoes, washed and sliced in half
1 egg
¼ cup milk
Basil leaves, cut into chiffonade
Sea salt and fresh ground pepper

Method:
1. Heat a large skillet over medium-low heat. Add the butter, onions, salt, and pepper and cook for 20 to 25 minutes, stirring occasionally, until the onions are soft and deep golden brown. Set aside.

2. Preheat the oven to 450°. Smush both pie crusts into a ball, knead it around a bit to combine them, then roll it out into one large, thin crust. Lay onto a shallow quarter sheet pan, or cut in half and use 2 standard pie pans. Sprinkle on the cheeses in a single layer, then lay on the caramelized onions, then layer the tomatoes over the cheese.

3. Mix together the egg and milk in a small bowl and brush it all over the crust around the edge of the tart. Bake the tart for 20 to 22 minutes, watching carefully to make sure the crust doesn’t burn. (If the crust is getting brown too fast, reduce the heat to 425°.)

4. Remove the tart from the oven and allow it to sit for 5 minutes. Sprinkle the basil all over the top. Cut into squares and serve.

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