Cook the selected pasta. Meanwhile chop the onions, garlic and spring onions into small pieces. Sauté the onions in oil in a pan. In the meantime, halve the Treviso, cut the stalk out and cut the leaves into strips. Now add the garlic and spring onions to the pan first, then the Treviso. Briefly (!) heat. Add the sugar, stock, pepper and parsley and douse everything with the cream. Pour over the cooked pasta and serve