1Heat oven to 350°F.
2Mix sauerkraut, apple, onions and barley in ungreased 2 1/2-quart casserole or rectangular baking dish, 13x9x2 inches. Place pork on sauerkraut mixture. Spoon barbecue sauce onto pork.
3Cover and bake 1 hour 15 minutes to 1 hour 30 minutes, uncovering for last 15 minutes, until pork is slightly pink when cut near bone, barley is tender and liquid is absorbed.