1 c. sugar
3 tbsp. cornstarch
2 sq. unsweetened chocolate (or substitute 3 tbsp. cocoa and 1 tbsp. butter of each square)
1 c. boiling water
3 tbsp. butter
1 tsp. vanilla

Mix sugar, cornstarch together. Add chocolate, butter, and vanilla. Add boiling water. Stir continuously over medium heat until it thickens, take off heat and dip onto ice cream. This recipe also works as a pudding icing for cake. Just double the recipe (depending on cake size). It never gets hard!