1 c. butter, softened
1/2 c. (firmly packed) brown sugar
1 c. confectioners' sugar
2 pt. vanilla ice cream, softened
Rum to taste
Nutmeg (opt.)

Blend butter, sugars and ice cream in bowl. Freeze. Combine 2 tablespoons mixture with 1 cup boiling water and rum. Sprinkle with nutmeg.