3 fashioned sour chocolate cake icing Recipes

butter, divided, powdered instant coffee, water, all-purpose flour, cornstarch, baking soda, salt, sugar, sour cream, eggs, unsweetened chocolate, melted, vanilla extract, unsalted butter, at room temperature, sugar (powdered ), unsweetened chocolate, melted, cooled, vanilla, powdered sugar, garnish (optional)

swans down cake flour, baking soda, salt, butter, softened, brown sugar, eggs, vanilla, unsweetened chocolate squares, melted and cooled, sour cream, boiling water, unsweetened chocolate squares, melted and cooled, icing sugar, butter, softened, water, egg