If you guys have time and feel lazy on a Sunday, or any day for that matter, try this!
2-3lb sirloin or chuck roast
1 bottle favorite barbecue sauce (I use KC Masterpiece Original)
1 onion, diced

Trim fat from roast, salt n peeper, then sear on both sides in oil. (I like it nice n brown). If you burn it, no worries... you're gonna slow cook this for a while!
Place in a covered dish, cover with onion, then cover pot and place in a 250 degree oven for 3-4 hours. Roast will produce its own juices, mix 1/2 cup drippings with 1/2 to 3/4 cup of barbque sauce (or to taste) no real measurements here.....shred the beef and mix with sauce, I use a separate dish for this. If you want to add more onions, go for it. Put back in the oven (covered) for 1 hour, then uncover and let cook for 1 more hour (6 hours total). Comes out almost fluffed like marshmallow creme.... serve with black beans/cilantro ...OR wrap in a tortilla with some chipotle and shredded red cabbage.... good stuff! Enjoy!