Stew the broccoli florets in the vegetable stock water. Dice the onion and ham.
Cook the pasta until al dente according to the package instructions.
Heat the fat in the pan. Sauté the onions and ham while turning. Deglaze with the broccoli broth. Stir in the sauce thickener, bring to the boil briefly. Mix in the broccoli. Season to taste with salt, pepper and nutmeg, stir in sour cream.