1 Boil the tomatoes for 20 s, immerse them in cold water and peel them. Then cut them into small cubes. Drain the capers
2 Peel and finely chop the onions, sweat them in an oiled frying pan while stirring, 3 to 4 minutes. Sprinkle them with brown sugar and caramelize.
3 Pour the tomatoes over the onions and simmer for 5 minutes. Remove from the heat and season with salt and pepper. Add the capers. Preheat the oven to 210°c (th7).
4 Quickly mix the butter, flour, hazelnut powder, grated Parmesan cheese and a pinch of salt. Pour the contents of the pan into a dish, sprinkle the crumble batter over it. Put in the oven for about 25 minutes.