1 c. sugar
3 tbsp. cornstarch
2 (1 oz.) sqs. chocolate - 1/2 c. cocoa
Pinch of salt
1 c. boiling water
3 tbsp. butter
2 tsp. vanilla

Mix sugar and cornstarch; add chocolate and salt. Add water; cook until mixture thickens. Remove from heat; add butter and vanilla, spread on cake while hot, for a glossy frosting which remains soft and smooth.