"Motsu-nabe"（もつ鍋） has become a popular food for ordinary people in Japan. Generally, "motsu" means animal's internal organ, but in this case, it means bovine's intestine.
Last Saturday, I took part in a party of parent's group of my son's high school wind orchestra club. There, I ate "motsu-nabe" drinking beer.
People in Japan can get "Motsu" in low price because it used to be thrown away in the past. So, "motsu-nabe" is a less expensive food.