Glossy Chocolate Frosting
["1 c. boiling water", "1 c. sugar", "3 Tbsp. cornstarch", "4 Tbsp. cocoa", "3 Tbsp. butter", "1 tsp. vanilla", "dash of salt"]
["Mix the sugar, cornstarch and cocoa; add to boiling water. Cook until thick.", "Remove from heat.", "Add the butter, vanilla and salt."]
["boiling water", "sugar", "cornstarch", "cocoa", "butter", "vanilla", "salt"]