Beer Beef Brisket

1 fresh beef brisket (2-1/2 to 3 pounds)
2 tsp. gluten free liquid smoke, optional
1 tsp. celery salt
Coarse salt & fresh ground black pepper, as desired
1 large onion, sliced
12 oz. gluten free beer
2 tsp. gluten free Worcestershire sauce
2 Tbs. cornstarch
1/4 cup cold water
Cut brisket in half; rub with liquid smoke, if desired, and celery salt, pepper and salt. Place in a 3-qt. slow cooker. Top with onion. Combine beer and Worcestershire sauce; pour over meat. Cover and cook on low for 8-9 hours or until tender. Remove brisket and keep warm. Strain cooking juices; transfer to a small saucepan. In a small bowl, combine cornstarch and water until smooth; stir into juices. Bring to a boil; cook and stir for 2 minutes or until thickened. Serve beef with gravy. (Yield: 6 servings)