This product is a "stew-style" retort curry with the richness of white sauce and the spices of curry. White chocolate is used as a secret ingredient, and it is said that it is finished mildly.
In February 2013, "Bon Curry" celebrated its 45th anniversary since its release, and it seems that the conventional water bath method has been changed to a cooking method in which the whole box is heated in a microwave oven.