Deglaze the onion with white wine and add the duck. Add the chorizo and crushed tomatoes. Simmer for 10 to 15 minutes.

For the mashed potatoes, peel the potatoes and carrots and roughly chop them. Steam for 18 minutes. Once cooked, mash the vegetables, add a little heavy cream to taste, then add the butter and mix well. Season with salt and pepper.

In a baking dish, make a layer of the duck and chorizo mixture, then cover with the mashed vegetables. Sprinkle with Parmesan cheese and bake for about 1 hour.