Easy Slow Cooker French Dip

It really doesn't happen often, like it's been over a year, that I have to work outside of the house. This is a recipe a friend of mine posted on my favorite message board. *omg!* This is delicious, quick and easy. I love my crock pot. The original recipe called for a rump roast but using a sirloin tip roast was suggested and that's what I bought.
Ingredients
4 lbs sirloin tip roast
1 (10.5 oz) can beef broth
1 (10.5 oz) can condensed French onion soup
1 (12 oz) can or bottle beer
6 French rolls
2 tablespoons butter
Directions
Trim excess fat from the rump roast, and place in a slow cooker. Add the beef broth, onion soup and beer. Cook on Low setting for 7 hours. Preheat oven to 350 ⁰F. Split French rolls, and spread with butter. Bake 10 minutes, or until heated through. Slice the meat on the diagonal, and place on the rolls. Serve the sauce for dipping.