Source:
http://www.fao.org/docrep/x0560e/x0560e06.htm
Gundruk is a fermented and dried vegetable product. It is produced by
shredding the leaves of mustard, radish and cauliflower leaves and
placing them in an earthenware pot to ferment. After five to seven
days the leaves are removed and dried in the sun. Gundruk is a very
important food product in Nepal ensuring food security for many Nepali
communities especially in remote areas. It is served as a side dish
with the main meal and is also used as an appetiser in the bland,
starchy diet. The annual production of gundruk in Nepal is estimated
at 2,000 tons and most of the production is carried out at the
household level. Gundruk is also an important source of minerals
particularly during the off-season when the diet consists of mostly
starchy tubers and maize which tend to be low in minerals (Karki,
1986).
Fermentation can improve the flavour and appearance of food. One
important area is the creation of meat-like flavour. Over the years,
Sudanese women have developed products to replace meat in their diets.
These include "kawal", fermented wild legume leaves,
"sigda" (fermented sesame press-cake) and "furundu" (fermented red
sorrel seeds). The strong flavours of fermented food products can
enhance a dull diet. Fermented vegetables such as pickles, gundruk and
sauerkraut are used as condiments to enhance the overall flavour of
the meal. A small amount of pickle can make a bland starchy diet (like
dahl and rice in Asia) much more appealing (Battcock, 1992).