Clean the mushrooms and cut into thin slices. Peel and finely chop the onion. Heat 25 g fat in a pot, fry onion and mushrooms thoroughly. Add rice, sauté briefly and deglaze with white wine and 600 ml broth.
Bring to the boil, cover and cook over a low heat for 20-25 minutes. Stir in grated parmesan, remove rice from the heat, cover and allow to swell for about 30 minutes. In the meantime clean and wash the carrots.
Cut the carrots in half lengthwise, cut into diagonal pieces and cook in the remaining stock for 12-15 minutes. Pour the carrots onto a sieve and collect the stock. Measure out 250 ml stock. Heat the remaining fat in a saucepan and sauté the flour in it.
Add milk and stock while stirring, bring to the boil and simmer for about 5 minutes. Carefully wash the chervil, dab dry and chop, except for a little bit for garnishing. Stir the chervil into the sauce and season with salt and pepper.
Add the carrots to the hot sauce and keep warm. Form 12 roasts from the lukewarm rice mixture with floured hands or hands moistened with water. Heat clarified butter in a frying pan and fry the roastings in portions while turning.
Arrange the ready roastings with the carrot ragout on plates. Serve garnished with chervil.