1 1/2 sticks butter
4 c. sugar
1/2 c. cocoa or less to color sugar
1 big cooking spoon Karo syrup
1/2 c. milk
2 tsp. white vinegar
2 tsp. vanilla

Melt the butter in a medium size boiler. Mix the sugar, cocoa, Karo syrup, milk and vinegar together. Pour this mixture into the melted butter; bring to rolling boil for 1 minute, stirring constantly. Place boiler in cold water in sink, stirring until icing loses its shine. Add vanilla. Stir. Spread while warm on cold cake.