Here is a super simple recipe that makes a good 2 to 3 meals. And different meals at that.
Step One is add a can of diced tomatoes, chopped onion, chopped garlic, a bit of cumin, and a bit of hot sauce (I prefer using a hot sauce that isn't super hot, and has other spices in it) to a slow cooker.
Step Two add an arm roast (or was it shoulder?) Just ask your butcher which roast cut is best to use for shredded meat.
Meal two: Beef Sandwiches. Put the meat in a pot. Add about 1/4 cup of BBQ sauce and 3 T of steak sauce. You don't want to coat the meat and have lots of sauce, you just want to add flavor. Also add some mesquite or BBQ spice mix. Heat through. Serve on hamburger buns with lettuce, pickles, onions, cheese and tomatoes.