1/4 c. butter
3 tbsp. buttermilk
1/2 c. chopped nuts
3 tbsp. cocoa
2 1/4 c. powdered sugar
1/2 tsp. vanilla

In saucepan, mix butter, cocoa, and buttermilk. Cook and stir to boiling. Remove from heat. Add sifted powdered sugar, nuts and vanilla. Pour over hot brownies and spread evenly.