1 (6 oz.) pkg. semi-sweet chocolate chips
1/2 c. butter
1/4 c. water
4 egg yolks, slightly beaten
2 tbsp. sifted powdered sugar
1 tsp. vanilla
1 (12 oz.) loaf pound cake

Heat chocolate, butter and water over medium heat; stir until mixture is blended. Cool slightly. Add egg yolks, sugar and vanilla. Stir until smooth. Chill until mixture is of spreading consistency, about 45 minutes. Slice pound cake horizontally into 6 layers. Spread chocolate between layers and then frost top and sides. Chill at least 45 minutes before serving. Cut into 1/4 inch slices.