Richmond Chocolate Frosting
["1 c. sugar", "3 Tbsp. cornstarch", "2 (1 oz.) sq. unsweetened chocolate", "dash of salt", "1 c. boiling water", "3 Tbsp. butter", "1 tsp. vanilla"]
["Mix sugar, cornstarch, 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."]
["sugar", "cornstarch", "unsweetened chocolate", "salt", "boiling water", "butter", "vanilla"]