The beef rib sandwich is what a Texas barbecue joint does with the single most intimidating cut on the menu once the bone is gone. A smoked beef short rib is one of the fattiest, most collagen-heavy pieces of the steer, cooked low over wood until the connective tissue has rendered and the meat gives no resistance. The defining move is not seasoning or sauce; it is the act of pulling that rendered meat off the bone and laying it on bread, taking a cut normally eaten with two hands off a rib and turning it into something that fits between slices. That transformation is the whole sandwich.
The craft happened in the smoker long before assembly, and the build only has to keep the meat from defeating its own bread. A beef short rib is smoked for many hours, often the longest cook in the pit, until the fat is silky and the meat probes like butter. Pulled from the bone it is dense, heavily marbled, and slick with rendered fat, which is why the bread is chosen to be honest about its job: plain white sandwich bread or a soft, slightly sweet bun, picked precisely so it disappears and soaks up the fat rather than competing with it. Texas barbecue runs on this restraint. Pickles and raw onion are the standard counter, not garnish: the acid of a dill slice and the bite of sliced white onion are the only things keeping a pile of rendered short rib from reading as one heavy, unbroken note. Sauce is treated with the usual Texas suspicion, offered on the side if at all, because a properly smoked rib is not supposed to need it. The pickle and onion do the work a sweeter style would hand to a sauce.
The variations are mostly about the cut and the bread. A chopped version dices the rib meat finer so it spreads evenly across the slice rather than clumping; a build on Texas toast trades the bun for a thick griddled slab that stands up to more fat. It belongs to the same family as the brisket sandwich and the rest of American barbecue, where the smoker does the work and the sandwich just carries it, and those relatives deserve their own articles rather than being crowded in here.