Irish Stew with Pearl Barley

Name: Irish Stew with Pearl Barley
Ingredients: 4 (12-oz., 1 1/4-inch–thick) bone-in lamb leg chops (3 lb. total); Salt and freshly ground black pepper; 9 ounces carrots (about 5 small carrots scrubbed and halved at an angle, or 3 large carrots, peeled and cut at an angle into 1 1/2-inch pieces); 9 ounces celery (about 4 stalks), trimmed and cut at an angle into 1 1/2-inch pieces; 3 onions, peeled and each cut into 6 wedges; 8 large cloves of garlic, peeled and left whole; 1/4 cup pearl barley; 2 1/2 cups lamb or chicken stock; 8–12 potatoes; 2 tablespoons chopped parsley leaves