Root Beer Frosting        

Ingredients:
6 tablespoons regular root beer, divided
1-1/2 cups confectioners' sugar
1/4 cup butter, softened
1/2 teaspoon vanilla

Directions:
Pour 3 tablespoons root beer over cake. Remove sides of pan. Cool completely. Mix 3 tablespoons root beer, confectioners' sugar, butter and vanilla for a thin frosting. Spread over cake, letting drip down sides.