chess pie recipe

1 9-inch unbaked pie crust (store-bought or homemade) - 1 1/2 cups granulated sugar - 1 tablespoon cornmeal - 1 tablespoon all-purpose flour - 1/4 teaspoon salt - 1/2 cup unsalted butter, melted - 1/4 cup milk - 1 tablespoon white vinegar or lemon juice - 1/2 teaspoon vanilla extract - 3 large eggs, beaten