1 lb. butter (really soft, room temperature)
1 lb. brown sugar
1 lb. powdered sugar
1 tsp. nutmeg
2 tsp. cinnamon
1 qt. vanilla ice cream (thaw to soft)

Blend butter and sugar together. Blend ice cream with above mixture; it will be grainy. Spoon into Tupperware-type container and freeze.

Serve: 1-2 tablespoons of this sauce and 1 jigger of dark rum in 6-8 ounce cups. Fill up with hot water. Serves 50.