1 cup all-purpose flour
3/4 cup yellow cornmeal
3/4 teaspoon salt
1 stick cold unsalted butter, cut into 1/2-inch pieces
3/4 cup plus 3 tablespoons shredded manchego cheese
4 tablespoons ice water
2 tablespoons extra-virgin olive oil
1 large onion, thinly sliced
2 1/4 pounds mixed heirloom tomatoes
1 1/4 teaspoon kosher salt, divided
3/4 cup shredded mozzarella cheese
1/4 cup mayonnaise
3 tablespoons breadcrumbs
3 tablespoons chopped fresh chives, divided
3 tablespoons chopped fresh parsley, divided
1 teaspoon chopped fresh thyme
1/4 teaspoon freshly ground pepper
1cupall-purpose flour
3/4cupyellow cornmeal
3/4teaspoonsalt
1stick cold unsalted butter, cut into 1/2-inch pieces
3/4cupplus 3 tablespoons shredded manchego cheese
4tablespoonsice water
2tablespoonsextra-virgin olive oil
1large onion, thinly sliced
2 1/4poundsmixed heirloom tomatoes
1 1/4teaspoonkosher salt, divided
3/4cupshredded mozzarella cheese
1/4cupmayonnaise
3tablespoonsbreadcrumbs
3tablespoonschopped fresh chives, divided
3tablespoonschopped fresh parsley, divided
1teaspoonchopped fresh thyme
1/4teaspoonfreshly ground pepper
Instructions
To make the crust: in the bowl of a food processor fitted with the metal blade, pulse the flour, cornmeal and salt. Add the butter and 3 tablespoons manchego; pulse until the mixture looks like coarse meal with pea-size bits of butter. Drizzle in 4 tablespoons ice water and pulse until the dough comes together; add 1 more tablespoon ice water if necessary. Turn out onto a sheet of plastic wrap and pat into a disk. Wrap and refrigerate until firm, about 45 minutes.
Put the dough between 2 sheets of parchment paper and roll into a 13-inch round. Transfer the dough to a 9 1/2-inch deep-dish pie plate. Fold the overhang under itself and crimp the edges. Pierce the bottom of the crust all over with a fork. Refrigerate until firm, about 20 minutes. Meanwhile, preheat the oven to 350 degrees F.
Line the crust with foil and fill with pie weights or dried beans. Bake until the edges are golden, about 20 minutes. Remove the foil and weights and continue baking until golden all over, 10 to 15 more minutes. Transfer to a rack to cool.
To make the filling: in a large skillet over medium heat, heat 1 tablespoon olive oil. Add the onion and cook, stirring, until golden, about 15 minutes. Let cool.
Thinly slice the tomatoes and toss with 1 teaspoon kosher salt in a colander. Let drain, gently tossing occasionally, about 30 minutes.
Increase the oven temperature to 375 degrees F. Combine the remaining 3/4 cup manchego, mozzarella, mayonnaise, breadcrumbs, 2 tablespoons chives, 2 tablespoons parsley, thyme, 1/4 teaspoon kosher salt, pepper and the sautéed onion in a bowl. Spread into the crust. Arrange the tomatoes on top. Drizzle with the remaining 1 tablespoon olive oil and season with pepper. Bake until the tomatoes are browned, about 50 minutes. Top with the remaining 1 tablespoon each chives and parsley. Serve warm.