This lemon pineapple upside-down cake is perfect for those who love citrus flavors. The cake is made with all-purpose flour, sugar, baking powder, salt, eggs, milk, vanilla extract, and lemon zest. The topping is made with canned pineapple rings, brown sugar, and butter. To make the cake, mix the dry ingredients together and then add the wet ingredients. Pour the batter over the pineapple rings and bake for 30-35 minutes. Let the cake cool for a few minutes before flipping it over onto a serving platter. Serve with a dollop of whipped cream and a sprinkle of lemon zest for a refreshing dessert.