1 pkg. (6 oz.) chocolate chips
3 tbsp. creme de cacao
5 lg. eggs, separated
1/2 c. pistachios (nuts)
Cool Whip

Melt chocolate chips with creme de cacao in double boiler. Remove from heat; cool. Beat in egg yolks one at a time; blend well. Fold in stiffly beaten egg whites. Cover and chill. Top with Cool Whip and chopped nuts.