Chipotle Beef Sandwiches

Ingredients:
1 large sweet onion, halved and thinly sliced
1 beef sirloin tip roast (3 lbs.)
1 jar (16 oz.) chipotle salsa
1/2 c. beer
1 envelope beefy onion soup mix
10 kaiser rolls, split

Directions:
Place onion in a 5 qt. slow cooker.  Cut roast in half; place over onion.  Combine the salsa, beer and soup mix.  Pour over top.  Cover and cook on low for 7-8 hours or until meat is tender.  Remove roast.  Shred meat with 2 forks and return to the slow cooker; heat through.  Using a slotted spoon, spoon shredded meat onto each roll.