Kulit Lumpia Finna. Krupuk () kerupuk () keropok () kroepoek or kropek is a deep fried cracker made from starch and other ingredients that serve as flavouring They are a popular snack in maritime Southeast Asia and is most closely associated with the culinary traditions of Indonesia in particular Javanese cuisineIt is an ubiquitous staple in its country of origin and later spread to other countries.