2 c. white sugar
4 heaping tbsp. cocoa
1 stick butter
1/2 c. milk
1/8 tsp. cream of tartar
1 tsp. vanilla

Cook slowly over medium heat until boiling (stir until sugar dissolves). Boil hard for 1 minute. Remove from heat and add cream of tartar and vanilla. Stir until cool enough to spread on large loaf cake.