Stuffed Onions and Grilled Sausages

Peel onions, cut off top third of each and hollow out. Chop removed pieces finely. Rinse peppers, cut in half, remove seeds and cut into small cubes. Rinse eggplant and cut into cubes as small as possible. Rinse zucchini and cut into small cubes. Heat 5 tablespoons of olive oil in a large frying pan and saute peppers for 2-3 minutes while stirring. Add eggplant and cook for an additional 2 minutes while stirring. Add zuccini and onion, cook for another 2 minutes, add 3-4 tablespoons of water, cover and simmer for 3-4 minutes over low heat. Stir and season with salt, plenty of pepper, sugar and parsley.  Season onions with salt and pepper and then sprinkle each with 1 tablespoon olive oil. Place in a greased ovenproof pan and cook for 30 minutes in oven. In the meantime, fry sausages in a grill pan. Fill cooked onions with pepper filling. Place on plates with grilled sausages and serve immediately.