Cook the spaghetti in salted water until al dente. Chop the chives. Dice the onion and let it glaze over, pour in the cream and reduce a little. Season with salt and pepper.
Cut the Gorgonzola into pieces, add to the saucepan and let melt while stirring. Cut the salmon into strips and add them to the sauce.
Drain the pasta, distribute on the plates. Pour the sauce over it and serve sprinkled with chives.