Crock Pot Swiss Steak Sandwiches

2 lb swiss steak

• 1 TB vegetable oil
• 1/2 C chopped celery, opt
• 1/2 C chopped onion
• 3/4 C beef broth
• 1/2 C tomato sauce
• 1/4 C water
• 1/4 C sugar
• 2 TB onion soup mix
• 1 TB vinegar
• 12 hamburger buns, split

Instructions

1. In a large skillet, brown the steak on all sides in oil. Transfer to crock pot.
2. In the same skillet, saute celery and onion for 1 minute. Gradually add broth, tomato sauce, and water, stir to lossen the brown bits.
3. Add sugar, soup mix and vinegar; bring to a boil. Pour over steak cover and cook for 7-8 hrs on low, or till meat is tender.
4. Skim fat from top.
5. Serve meat in buns with cooking juices.