Basically, I started off with this recipe, which claimed to be the BEST pot roast ever ((it IS pretty good)).
I mixed in the au jus mix instead of just putting it on top, and I used sprite instead of coke or pepsi. ((from what I understand, the carbonation does something to help make it tender? Don't know if that's actually true.))
I also cooked it with onions, baby carrots, and small yukon gold potatoes. I served it all up with some rolls with butter & jelly. Yummy.