Squash and Caramelized Onion Tart

Squash and Caramelized Onion Tart

Squash and Caramelized Onion Tart An 11"- or 12" diameter fluted tart pan with removable bottom or a 9"-diameter springform pan Crust1 cup whole wheat flour1 tsp kosher salt1 cup all-purpose flour, plus more for surface10 tbsp unsalted butter, chilled,...