1 1/2 c. sugar
6 tbsp. cornstarch
6 tbsp. cocoa
1/8 tsp. salt
1 1/2 c. boiling water
4 tbsp. butter
1 1/2 tsp. vanilla

Mix sugar and cornstarch. Add sifted cocoa and salt. Mix well. Stir in water. Cook over low heat until mixture thickens, stirring constantly. Remove from heat, add butter and vanilla. Spread hot.