Wash the plums and grapes, remove the seeds and quarter. Peel the bananas and slice. Melt butter in a pan and add some sugar. Add the fruits and deglaze with rum.
Cook milk with water and add the Polenta while permanently stirring. Add 3 tablespoons of butter and cook until done. Let the Polenta cool down, form small portions and place in an ovenware. Add cream, sugar and cinnamon on top and bake for 20 minutes at 200 °C.
Decorate the Polenta, the profiterole together with the fruits on a plate.