Korokke is made by mixing cooked chopped meat, seafood, or vegetables with mashed potato or white sauce, usually shaped like a flat patty, rolling it in wheat flour, eggs, and Japanese-style breadcrumbs, then deep-frying this until brown on the outside.

It is thought that the korokke using mashed potatoes was invented because dairy processing technology had not been popularized in Japan at that time.

[1] The first mention of a "kuroketto" appears in cookery books from the Meiji era.

[2] Korokke can be found in almost every supermarket and convenience store in Japan and enjoyed for its taste and its low cost.

Gurakoro is a product introduced by the Japanese McDonald's which is made by sandwiching guratan korokke.