Peel, wash and dice the carrots. Clean, wash and cut broccoli into florets. Melt 30 g fat. Sweat flour in it. Stir in cream and stock, let simmer for 10 minutes.
Steam vegetables in the remaining fat for 10-15 minutes. Put spaghetti in plenty of boiling salted water and cook for 10 minutes. In the meantime chop the hazelnuts. Slice the cheese with a peeler. Season sauce with salt, pepper and nutmeg.
Season vegetables with salt. Drain spaghetti and toss in oil. Arrange spaghetti with sauce, vegetables and cheese.