They're fried exclusively in coconut oil, never a neutral vegetable oil — a choice locals say gives Kerala's chips a distinct aroma that's impossible to fake with any other fat.
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.