A rich cake is a type of dessert that is made with a high proportion of butter, sugar, and eggs. The term 'rich cake' can also refer to a cake that is filled with luxurious ingredients such as chocolate, nuts, and dried fruits. One example of a rich cake is the BROWNIE, which is a dense, fudgy cake that is usually made with cocoa powder and chocolate chips. The word 'BROWNIE' is derived from the Old English word 'ELF, ' which means 'small fairy.'