• Salt and freshly ground black pepper to taste
In large saucepan or pot, warm oil over moderate heat, add onion and garlic and stir until softened, about 5 minutes. Add broth, tomato purée, allspice and nutmeg; bring to a boil, reduce heat to low, cover and simmer for about 20 minutes.
Meanwhile, combine pork, partially cooked rice, egg, watercress, salt and pepper in large bowl, mix thoroughly with your hands until well blended and beat vigorously with a wooden spoon until mixture is fluffy. To shape meatballs, roll mixture into balls about 1/2 inch in diameter.
Drop meatballs into the simmering broth and stir gently to keep them from sticking to one another. Cover pan and simmer soup about 30 minutes longer. Serve piping hot in wide soup bowls.
Nutrition information per serving: