Cook the pasta until al dente according to the package instructions.
In the meantime, chop the walnuts or chop them in the food processor. Fillet the orange while collecting the juice.
Heat the milk in a saucepan and let the Gorgonzola melt in it. Add the orange fillets and the chopped walnuts. Bring everything to the boil and season with salt, pepper and nutmeg. If the sauce is too thick, just add some milk.
Drain the pasta and mix immediately with the sauce.
A dry red wine tastes very good with it.
The noodles are also very tasty as an accompaniment to a roast beef or steak.