In the top of a double boiler over boiling water melt:
2 squares unsweetened chocolate
½ cup butter
Keep water boiling while you add:
½ cup brown sugar, packed
1 lb. powdered sugar
1/3 cup sour cream
2 T. light corn syrup
1 tsp. vanilla
1/8 tsp. salt
Cook only until dissolved. (Mixture will harden like fudge if overcooked.)
Cover top of cake with warm frosting, working rapidly before it cools and is hard to manage.
This is really rich frosting. I haven’t used it on a layer cake for some time so I don’t know how easy it is to manage. It is a rich and delicious frosting if you like chocolate.