Bring a good 1 l salted water to the boil in a large pot. Clean and wash the cauliflower. Divide into florets, cut the stalk into sticks (see tip below). Cook in boiling salted water for 3-4 minutes until al dente.
Then pour into a sieve, quench cold and drain.
In the meantime cut the salsicce into slices. Heat the oil in a large pan. Fry the sausage for 4-5 minutes. Peel and chop the onion, add and fry until transparent.
Add the cauliflower and fry for 2-3 minutes. Wash parsley, shake dry and chop coarsely. Mix in parsley and olives. Continue cooking for 1-2 minutes. Crumble the feta and mix in until it melts slightly.
Season to taste with salt and pepper.