Chocolate Velvet Cake Frosting
["1 1/2 c. sugar", "6 Tbsp. cornstarch", "1/4 tsp. salt", "1 1/2 c. boiling water", "3 sq. unsweetened chocolate", "1/2 stick butter or oleo", "1 tsp. vanilla"]
["Combine sugar, cornstarch and salt in saucepan.", "Slowly stir in boiling water until smooth.", "Cook, stirring constantly,\tuntil mixture", "thickens.\tAdd chocolate and butter; stir until", "melted. Remove", "from", "heat.", "Add vanilla.", "Pour into a bowl", "and", "chill, stirring", "often, until it becomes spreading consistency."]
["sugar", "cornstarch", "salt", "boiling water", "unsweetened chocolate", "butter", "vanilla"]