Clean, wash and slice the mushrooms. Peel and finely chop the onion. Roast the nuts and take them out.
Heat the oil. Fry the mushrooms for about 5 minutes until golden brown. Fry onion and hazelnuts briefly. Season with salt and pepper. Add milk and cream, bring to the boil. Simmer sauce for 3-5 minutes.
Meanwhile cook the pasta in plenty of boiling salted water for about 10 minutes until al dente. Thicken sauce with sauce thickener. Season to taste with salt, pepper and nutmeg. Clean, wash and pluck the rocket. Drain noodles.
Mix rocket and mushroom-nut sauce with 2⁄3 Serve immediately and sprinkle with the rest of the rocket.