1/2 c. butter
2 1/2 tbsp. flour
1/4 tsp. salt
1/2 c. milk
1/2 c. brown sugar
2 c. confectioners sugar (sifted)
1 tsp. vanilla
1 c. chopped black walnuts

In saucepan, blend butter, flour and salt. Cook 1 minute; do not brown. Add milk; cook until thick. While hot, add brown sugar (firmly packed) beat well. Add 2 cups confectioners sugar; beat until thick and cream. Add vanilla and walnuts. Spread over top and side of cooled cake.