Preheat oven to 350°F. Grease 4 ramekins.
In a pan, melt butter and brown sugar to make a quick caramel. Pour a spoonful into each ramekin.
Add a few chunks of pineapple and papaya into each ramekin over the caramel.
Mix cake batter ingredients in a bowl. Pour over fruit in each ramekin.
Bake for 18–22 minutes or until golden and springy.
Cool slightly, then invert to serve warm. Spoon any extra fruit-caramel on top.