Finely chop the onion. Clean the carrots and cut into slices. Peel the potatoes and cut into cubes.
Sweat the onion in a saucepan with a little butter until translucent. Add the carrots to the onions and sweat them too. Then add the sugar and caramelize the carrots. Add the potatoes and sauté briefly. Add the broth and simmer on a low heat for 30 minutes.
Meanwhile, cut the meatloaf into slices and fry in a pan (possibly in 2 stages, depending on the size of the pan). At the end of the cooking time, put the meatloaf in the pot with the carrots. Season to taste with pepper, a little nutmeg, cream and the parsley.