Bring the broth to a boil. Add the escarole, and simmer while you prepare the meatballs. In a small bowl, combine the pork, garlic, shallots, parsley, and the egg yolk. Season with salt and pepper. Form into 3/4-inch meat balls. Drop the meat balls into the broth and simmer until they are cooked, about 5-8 minutes. Drop in the pastine, and taste to adjust the seasonings. Turn off the heat. Begin to stir the soup in a clockwise motion and slowly drizzle in the beaten eggs, so it will form strands.
Yield: 6 portions