Pre-heat oven to 350°F.
Soak the bread crumbs in the milk for 10 minutes.
Add the ground lamb, or beef, the oregano, nutmeg, beaten egg, salt, pepper and Worcestershire sauce.
Mix well and form into 1 1/2-inch balls.
Fry the meatballs in in an olive oil to brown on all sides.
Remove meatballs to a covered, oven safe pan.
To the frying pan, add the diced carrot, celery, garlic and red onion.
Sauté together until the onions soften, then add this mixture to the pan with the meatballs along with all the remaining ingredients except the chickpeas and olives.
Place in oven, covered for about an hour, then add the chickpeas.
Return to the oven for an additional hour at 325°F.
In the last 10 minutes of cooking time you can add the olives if you are using them.
Serve over couscous.