Crock Pot Chow Mein

1 lb ground beef
1 medium onion, chopped
1 bunch celery, sliced
2 (14 ounce) cans Chinese vegetables, drained
2 (1 1/4 ounce) envelopes brown gravy mix
2 tablespoons soy sauce
hot cooked rice

In a skillet, cook beef and onion over medium heat until meat is no longer pink and drain.
Transfer to crock pot.
Stir in the celery, Chinese vegetables, gravy mixes and soy sauce.
Cover and cook on low for 4 hours or until celery is tender, stirring occasionally.
Serve over rice.