Cook the pasta in boiling salted water for 4-6 minutes. Clean, wash and halve the Brussels sprouts. Peel, clean and cut carrots into pieces. Clean and wash spring onions, shake dry and cut into rings.
Finely grate the parmesan. Pour the pasta into a sieve and drain.
Pre-cook carrots and Brussels sprouts in plenty of boiling salted water for about 4 minutes, pour into a sieve and rinse with cold water. Wash the meat, dab dry and cut into pieces of approx. 1 x 1 cm.
Mix the pasta, vegetables, meat and about half the cheese in a large bowl and place in an ovenproof dish (approx. 2.5 litres capacity).
Mix cream, milk and eggs. Season with salt, pepper and nutmeg. Pour evenly over the pasta mixture and bake in a preheated oven (electric cooker: 200 °C/ convection oven: 175 °C/ gas: see manufacturer) for approx. 25 minutes.
Sprinkle the rest of the cheese over the casserole about 10 minutes before the end of the baking time. Bake to the end, remove from the oven and serve.