In your 10’ Cast Iron Skillet saute chopped onions in olive oil for 2-3 minutes or until tender. Remove and set aside.
In a large bowl mix beef, pork, 2 eggs, bread crumbs, onions, and nutmeg. Mix all ingredients until well combine.
Use your hands to form the meatballs about an inch-thick. This should make about 20-30 meatballs.
Melt 2 tbs of butter in the cast iron skillet over a medium heat fry meatballs until brown on all sides. remove meatballs from the pan. In the same pan melt 2 tbs of butter add flour. Add beef broth slowly stirring constantly. The sauce will be begin to thicken. Re Add the meatballs to the sauce and let cook on a medium heat for ten more minutes. Remove the meatballs and add in sour cream. Mix well until you have a nice creamy sauce.
Serve over your meatballs.