For the meatball, mix all the ingredients and roll into 1-inch balls.
Heat oil in a soup pot, brown the meatballs evenly all over; set aside.
Add onion and garlic and saute for 1 minutes, add kale and continue to saute for 2 minutes. Pour chicken stock, add meatballs and the Parmesan cheese slice, and bring them to gentle boil.
Reduce the heat to low, cover with a lid, and simmer for 15-20 minutes or until the kale gets soft. Add a few dashes of freshly ground nutmeg at the end and let all the flavor mingle. Serve hot with crusty bread.