Cook the spaghetti according to the instructions on the packet in plenty of boiling salted water until al dente. Then pour into a sieve and drain.
Melt the butter in a pan and fry the diced meat loaf in it until crispy. Add two thirds of the cream and bring to the boil. Mix in the spaghetti and heat up. Season with salt, pepper and nutmeg. Mix the egg yolks with the rest of the cream and the sweet mustard and add. Warm up briefly, but don`t let it boil anymore.
Mix in or sprinkle over the parmesan and serve immediately.