Chocolate Butter Frosting
["5 oz. (5 sq.) unsweetened chocolate, chopped", "2 sticks unsalted butter, softened", "3 1/2 c. sifted confectioners sugar", "2 large eggs, lightly beaten", "1 1/2 tsp. vanilla"]
["Melt the chocolate in the top of a double boiler over barely simmering water.", "Cool to room temperature.", "Place the butter in a large bowl and beat with an electric mixer until fluffy, about 1 minute.", "Gradually beat in the sugar alternately with the eggs and vanilla.", "Beat in the cooled chocolate to make a frosting of good spreading consistency.", "Use at room temperature.", "The frosting will set if chilled."]
["unsweetened chocolate", "butter", "confectioners sugar", "eggs", "vanilla"]