This recipe for strawberry rhubarb upside-down cake is a fun twist on a classic dessert. The cake is moist and fluffy, with a sweet and tangy flavor from the strawberries and rhubarb. To make this cake, you will need flour, sugar, baking powder, salt, eggs, oil, vanilla extract, strawberries, rhubarb, and butter. Melt the butter in a skillet, then add the chopped strawberries and rhubarb and cook until softened. Pour the fruit mixture into a greased cake pan, then pour the cake batter on top. Bake for 30-35 minutes, or until a toothpick inserted into the center comes out clean. Let the cake cool for a few minutes, then invert onto a serving platter. This cake is perfect for anyone who loves a fun and unique dessert.