Hobnail Icing
["1 c. sifted confectioners sugar", "2 to 3 egg yolks or 1 small egg", "1/4 c. milk", "3 sq. unsweetened chocolate (3 oz.), melted", "1 Tbsp. soft shortening", "3/4 tsp. vanilla"]
["Place bowl in ice water.", "Use mixer to beat until of spreading consistency.", "Spread icing smoothly on cake."]
["confectioners sugar", "egg yolks", "milk", "unsweetened chocolate", "shortening", "vanilla"]