Can substitute parsley for coriander, if neccessary. Combine beef, pork, rice, egg, oregano, 1 teaspoon salt and quarter teaspoon pepper (or to taste) in a large bowl. Shape into small balls, about the size of golf balls. Saute onion and garlic in heated oil in a large kettle until tender. Mix in tomato paste. Add bouillon; season with salt and pepper. Bring to a boil. Add meatballs and reduce heat. Cook slowly, covered, about 30 minutes, until meatballs are cooked. Stir in coriander or parsley. Serves 6 to 8.