Did this for the first time with two chuckles just yesterday, the stout recipe minus jalapeņo seeds in one pan and beef stock instead of the Guinness in the other pan. My wife hates beer but even liked the stout recipe best.
Basically, don't put in too many jalapeņo seeds and be sure to cook long enough! We loved this dish and I suspect my wife won't be doing pot roast with our chuck roasts near as much any more!
If you're lookin' you ain't cookin', but if you're overcookin' you might start lookin'!