Kushi is called everything you can spike on a skewer and grill. There is a wide variety to choose from such as juicy beef, pork belly, tomatoes, mushrooms, asparagus, eggs, fish, squid, tongue, heart, and other organs.. sometimes the pieces are nicely rolled in bacon.
They come with either a sweet and savory sauce or just salt. Kushi is meant to be eaten with your hands, so you may directly eat them off the skewer if you like.