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Icing for gingerbread house

Why I Love This Recipe
Icing
Ingredients You'll Need
3 egg whites
1/2 teaspoon cream of tartar
1 (16 oz.) box of confectioners sugar
Directions
1. In a large bowl combine all ingredients. Beat several minutes with an electric mixer until smooth. The icing should be thick.
2. Use food coloring to achieve the desired color effects.
3. The icing will harden quickly. Store in a tightly sealed container if you are not using it right away. While you work with the icing, keep a damp cloth over the unused portion.