Meatball sour soup

Broth:
1 medium onion, cut in thin strips
2 medium carrots, chopped finely
1 handful of rice (about 1/2 cup)
2 Tbsp oil, for sauteeing
1-2 Liters water
tomato juice (or sauce, depending on desired consistency), about 2 cups or to taste
Romanian (or Polish) "bors" (or lemon juice) to taste
Meatballs:
1/2 Kg ground meat
1 handful rice
1 egg
1 slice of bread (without the crust), soaked in water and well-drained
chopped onion and parsley, salt, pepper to taste

To make the meatballs, mix together all the ingredients. Then take a little of this mixture at a time in slightly damp hands (so as not to be sticky) and make walnut-sized little balls. For the broth, sautee the onion slightly, then add the carrots and the rice, and leave for 5 minutes. Add the water and leave to boil for 15 minutes, then add the meatballs. Boil several times and towards the end add the tomato juice or sauce and the "bors" (the "bors" is not supposed to boil more than a couple of times). Make sure that the meatballs are cooked through, top with more fresh chopped parsley and serve with good bread.