Clean and wash the broccoli and cut it into small florets. Cover and steam for about 5 minutes in about 3/8 l boiling salted water. Drain, catch the vegetable water
Peel and finely chop the onion. Steam in hot fat in a pot until translucent. Dust with flour and sweat it on. Stir in vegetable water, milk and stock. Bring to the boil and simmer at low heat for about 5 minutes. Dice the gorgonzola. Melt the whole cheese in the sauce
Cook the spaghetti in plenty of boiling salted water for about 8 minutes until al dente. Wash and halve the tomatoes. Fry in hot oil for about 3 minutes
Season the sauce with salt and pepper. Heat broccoli in it. Wash the chives and cut into fine rolls. Drain the spaghetti. Serve with sauce and tomatoes. Sprinkle with chives and coarse pepper