The easiest recipe in the world. I don't care how cooking-naive you think you are, you can make THIS.
1 roast (I used sirloin this time, but chuck, arm and others do just as well) 3-5 pounds, not too fatty
2 packets Good Seasons Italian Dressing mix
1 can of beer (seriously, any kind.) or, if you don't do beer, water, stock, wine, soda....but beer gives it a certain flavor and tenderizes the meat nicely.
Dump the whole shebang into a crock pot and cook on Low all day while you are at work. When the roast falls apart, slap it on a bunch of your favorite sandwich rolls and maybe add a slice of pepperjack cheese to it, like I do. Don't forget napkins.
I've also known people to do this with chicken breast, and add a jar of pepperoncinis. I sometimes add a tablespoon or so of extra Italian Seasoning, for some extra ooomph.
Really, its three ingredients, and literally a "one-pot" meal. You can't go wrong.