The marinating time is short, the cooking is fast and easy. The key to cooking pork bulgogi to perfection is to choose a good cut of pork and to cut it into slices thin enough to make sure that it cooks in a very short time.The cooking time specified below presumes your meat has already been sliced. If you can't get pre-sliced pork from your grocery, you may buy a slab of pork shoulder, and stick it in the freezer for an hour or so before slicing. It is much easier to slice semi-frozen meat. You'll be able to cut it into slices of uniform thickness. And, by the time you're done slicing, the meat would have thawed to make it ready for the marinade.