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

Mix sugar, cornstarch and cocoa. Add water and cook 3 to 5 minutes over medium heat, stirring now and then. Add salt, butter and vanilla last and stir in. Store in refrigerator.