Dice all the vegetables. Place them and the meat bones in a 10 quart pot. Cover with water. Simmer for 1 1/2 hours.
Grate the onion and tomato over the meat and mix. Roll into small balls, and drop into the soup. Simmer until meatballs are cooked through and you are ready to serve.
Add salt and pepper to taste.
Notes
This recipe is suitable for Passover. Check that the ingredients are okay according to your level of observance.