Macadamia Nut Orange Cookies

Step 1: Preheat oven to 350 degree F.

Step 2: Combine flour, powdered sugar, and cornstarch in a large mixing bowl.

Step 3: Using a pastry blender or two knives, cut in 2 cups of butter until mixture resembles coarse crumbs.

Step 4: Stir in the 1 cup nuts.

Step 5: Combine egg yolks, 1 tablespoon orange peel, and 4 tablespoons of the orange juice in a small mixing bowl; add to flour mixture, stirring until moistened. If necessary, add just enough of orange juice to moisten.

Step 6: Knead dough on a lightly floured surface until it forms a ball.

Step 7: Arrange balls on an ungreased cookie sheet.

Step 8: Dip bottom of a fluted glass in granulated sugar, and use it to flatten one ball to 1/4-inch thickness.

Step 9: Repeat for remaining cookies.

Step 10: Bake in the preheated oven for 12 to 15 minutes or until edges begin to brown.

Step 11: Transfer cookies to a wire rack; let cool.

Step 12: Meanwhile in a small bowl stir together powdered sugar, 3 tablespoons butter, 1 teaspoon orange peel and enough of the juice to make sauce of speading consistency.

Step 13: If desired, sprinkle with finely chopped macadamia nuts.