response: I'm not sure about that.  I do know, though, that sometimes other things are added to the cake ingredients, like dried fruit, cocoa, vanilla extract, or fresh fruit.
original_response: Yes it is common to add frosting made from vanilla or cocoa. Sometimes fruits and nuts are added as well.
history: hey i love cake, its so delicious, do you know much about it? Oh do you!  Well for starters, I know it's a sweet dessert form, and it's usually baked. What are cakes made of? Ah, they  have multiple ingredients such as flour, eggs, sugar, butter, a leavening agent like baking powder, and a liquid. what about after is done baking? do you add anything sweet on top of it?
knowledge: Common additional ingredients and flavourings include dried, candied, or fresh fruit, nuts, cocoa, and extracts such as vanilla, with numerous substitutions for the primary ingredients.