Add the broth. Bring to a boil and then add the meatballs one at a time.
Keep boiling until meatballs rise to the top then add the tomato juice or paste, lemon juice, salt and pepper to taste. Continue to simmer over medium heat for about 20 minutes. Slowly pour in the eggs in a steady stream. Sprinkle with chopped parsley. Transfer to a serving bowl, top with a dollop of sour cream and serve.