Heat the olive oil in a soup pot, add the onion, celery and celery tops; cook over low heat until softened, about 8 minutes. Add the hot broth and salt and bring to a boil, then simmer, partially covered, for 20 minutes.
Prepare the Italian toasts. Lightly brown the 6 slices of Italian bread in a 400 F oven until golden on both sides. Brush with olive oil on one side.
Place the Italian toasts in the bottom of 6 soup bowls. Divide the eggs, sausage, and cacciocavallo cheese evenly among the 6 servings and place on top of the bread. Bring the soup to a boil and ladle while hot into the bowls. Sprinkle with the grated pecorino cheese and lovage leaves (or chopped celery tops).
"We Called It Macaroni"; Nancy Verde Barr