Pineapple Upside-Down Cake

White sugar was at one time an expensive luxury and many early American recipes used brown sugar. In this inventive dessert the brown sugar, butter and pineapple rings are put in the bottom of the pan and are later transformed into a scrumptious topping. Traditionally it is made in a skillet (heavy cast-iron frying pan) but if you haven’t one that can go in the oven, use a cake tin. Other fruits can be used but pineapple is particularly good.