Broiled pig innards on skewers is one of the most popular food in Japan.
The argument is that offal, which before the World War II had been either discarded or used as fertilizer, was grilled and eaten by Korean female factory workers in Japan and became what is now known as horumonyaki, and that therefore the custom of grilling offal (small intestine) originated not in Korea but Japan. (weblio)
It’s so delicious and healthy food!!