Pineapple Upside Down Cupcakes are the rare treat that do not need frosting or even cupcake liners, for that matter. Instead, these can be assembled right in the cupcake tin, as long as it has been well coated so that they do not stick. The cupcake assembly process starts off with a halved maraschino cherry and some pineapple mixture. (This is made from crushed pineapple, butter, brown sugar and chopped walnuts.) These go on the bottom, and the cupcake batter is poured over them. Bake and serve upside down, of course!
Source The Cake Blog