1 cup white sugar
4 cups ground walnuts
1 tablespoon orange zest
2 tablespoon Grand Marnier
4 egg whites
2 cups confectioners' sugar
Directions:
Preheat oven to 200°F (100 degrees C).
Combine the white sugar, ground walnuts, orange zest, grand marnier and 3 egg whites. This mixture will become very sticky and paste-like.
Form the paste into a long rectangle on a smooth surface and sprinkle both sides with sugar so that it won't stick. The rectangle should be about 16 x 4 inches.
Make the frosting by mixing the remaining egg white with the confectioners' sugar. You don't need to beat the egg white first!
You may need to add a little water, or a little more powdered sugar to form a paste that you can easily spread, but that isn't runny. Spread the frosting over your rectangle.
Use a knife covered with confectioners’ sugar to cut the rectangle into small 1 x 2 inch bars and place them on an ungreased cookie sheet.
Bake for about 35 minutes or until frosting is hard but still white.