Gundruk is a popular Nepalese dish made by fermenting and drying several leafy vegetables such as rayo sag, mustard leaves, radish leaves, and cauliflower, in order to produce a sour product characterized by its dark brown color. It is a versatile food item that can be served both as an appetizer or a side dish, but it can also be made into a soup. Due to the fact that it is a great source of minerals, gundruk is especially important in rural areas of the country where people mostly feed on maize and tubers.