“Old clothes” may not sound that appetizing, but it’s one of those overcooked, funky, juicy, tender dishes you can’t stop eating (at least I can’t). And the only thing even remotely difficult about it is shredding the steaks into the ropy strands that give Ropa Vieja its fanciful name. Still, it’s not you-can-do-it-wrong difficult; it’s just a bit of an upper body workout.