Slow-Cooked Barbecue Beef with Southwestern Flavors (With Quick Cook Option)

Makes 8 to 10 sandwiches or soft tacos Thanks to Jason Clee for  such a great photo of this pulled beef. You can find cans of chipotle chilies in adobo in the southwestern section of most well-stocked grocery stores. They add subtle smokiness and heat to the dish, but if you can't find them, feel...