Tonkatsu is breaded and deep fried pork cutlet. If you do the same with chicken, it's called Chicken-Katsu. You can find many recipes on internet. People who cook Japanese food often love to get sweet and spicy sauce specifically for Tonkatsu/Chicken-Katsu during their visit to Japan. If you want to eat some good Tonkatsu in Japan, Maisen is a good place to try!