Ingredients Crust: 1 1/2 sticks (3/4 cup) cold unsalted butter, cubed, plus more for dish 1 1/2 cups unbleached all-purpose flour 2/3 cup light brown sugar 1 teaspoon kosher salt Filling: 1 stick (1/2 cup) unsalted butter, softened 1 cup light brown sugar Pinch salt 1/3 cup light corn syrup 1/4 cup unbleached all-purpose flour 3 cups coarsely…