Ingredients: For the Walnut Shortbread: 2 cups all-purpose flour ½ teaspoon salt 1 cup chopped walnuts 2 sticks unsalted butter, softened ½ cup powdered sugar 1 teaspoon vanilla extract For the Dulce de Leche Ice Cream: 1 cup milk 2 cups heavy cream ½ teaspoon salt 1-⅔ cup dulc…