The traditional chips are cut from nendran, a large local plantain, and fried in coconut oil, which gives them their aroma; the jaggery-coated sharkara upperi is a fixed item on the Onam sadya leaf.
Thin slices of raw green plantain are fried in coconut oil until golden and crisp, salted, and sometimes finished with turmeric or a jaggery glaze called sharkara upperi. Roadside stalls and shopfronts across Kerala sell them by the bag, freshly fried in huge batches for both daily snacking and festival trays.