1 c. sugar
4 tbsp. (rounded) flour
3 tbsp. (level) cocoa
1/2 tsp. salt
2 1/2 c. boiling water
Small lump butter (size of walnut)
2 tsp. vanilla
1 baked pie shell

Mix sugar, flour, cocoa and salt together in saucepan. Add boiling water, stir well and cook over medium heat until thickened. Add butter and vanilla. Cool and pour into pie shell. Refrigerate. Serve with Cool Whip.