3 old sour chocolate cake icing Recipes

all-purpose flour, sugar, unsweetened cocoa powder, baking soda, table salt, water, vegetable oil, white vinegar, instant coffee granules, vanilla extract, unsalted butter, sugar, unsweetened cocoa powder, salt, heavy cream, sour cream, instant coffee granules, vanilla extract

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)