In a heavy bottomed soup pot heat olive oil over medium to medium-high heat. Add pancetta and cook until crisp, 2 to 3 minutes. Add onions and 2 cloves of garlic and saute 4 to 5 minutes then add the escarole and wilt. Season with salt, pepper and nutmeg. Stir in beans, add stock and water and bring to boil.
While stock comes to a boil, combine meat, egg, bread crumbs, milk, a handful of cheese, fennel, allspice, parsley, salt and pepper. Combine and roll into 1-inch balls, and add to the soup. Cook 2 minutes then add in pasta and cook 6 minutes more. Turn off the heat, garnish with lemon zest and serve with cheese passed at the table.