1 sq. unsweetened baking chocolate
1/2 c. water
2/3 c. sugar
1/4 c. butter
1 tsp. vanilla

Place chocolate in saucepan with the water over low heat. Cook and stir until chocolate is melted. Add the sugar, stirring until sugar is dissolved. Bring to a boil and remove from heat. Add butter and vanilla and stir until blended.