Chocolate Frosting - cooking recipe

Ingredients

2 (1 oz.) sq. unsweetened chocolate
1/2 c. butter, softened
1 (16 oz.) pkg. powdered sugar, sifted
1 egg
1 Tbsp. whipping cream
2 Tbsp. vanilla extract
1 1/2 tsp. lemon juice

Preparation

Place chocolate in top of a double boiler; bring water to a boil.
Reduce heat to low; cook until chocolate melts.
Set aside to cool slightly.
Cream butter with electric mixer.
Add chocolate and remaining ingredients, beating until smooth.