For the lung roast with carrot mashed potatoes, parcel the lung roast, season with salt, pepper and sear on all sides in clarified butter.
Remove from the pan. Deglaze the pan with brandy and wine. Add some vegetable soup and water. Allow to reduce. Add cold butter.
Add meat, rosemary and thyme, let simmer at low temperature until pink. In the meantime, cook the diced carrots and potatoes in a little vegetable soup until soft. Season with nutmeg, salt.
Add 1 tablespoon clarified butter and mash to puree. Chop 1 potato into very fine slices. Season with oil, parmesan and chili. Bake in the oven at 175 degrees to potato chips.
Arrange the puree in a ring and garnish with chips. Cut the meat into slices and serve with the sauce.