Preheat the oven to 350 degrees F.
Cook 1 large chopped onion with olive oil in a pan stirring occasionally until light golden brown.
Mix 1.5 lbs of ground veal, 1 cup of bread crumbs, 1 cup of grated Parmesan cheese, 2 eggs and the cooked onions.
Add 1/2 cup water to the mixture- it should be slightly wet and shape the meat mixture as a giant meatball.
Add salt and pepper.
Cook the meatball in a large pan with olive oil until each side is golden brown (approx 5 min).
Transfer the meatball onto a baking pan and cook in the oven oven for 50 min.
Serve with the tomato sauce heated.