1 - Place flour in a large roasting bag; shake to coat. Rub brisket with liquid smoke, if desired, celery seed and pepper; place in bag. Place in roasting pan. Combine chili sauce and barbecue sauce; pour over brisket. Seal bag.
2 - With a knife, cut six 1/2-inch slits in top of bag. Bake at 325F for 3 1/2 to 4 hours or until meat is tender. Let stand for 5 minutes. Carefully remove from bag. Thinly slice meat across the grain.
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