Soak urad dal overnight and grind to a fine paste.
It should have the consistency of cake batter. Put
it n a vessel and whisk it very well so that the mixture
is fluffy.
Heat oil well in a deep frying pan. Test if the
oil is ready by dropping a little of the mixture into
the pan if it fluffs up and floats to the surface
the oil is ready.
Take a piece of wet cloth on your left palm. This
allows the vadas to slide off into the pan without
difficulty.
Put some of the mixture onto the cloth and flatten
it, shaping it into round one-inch vadas. Slide these
off one by one into the oil, and deep fry.
They should be fried through and through, and have
a golden brown colour. Take care not to make the vadas
too thick.
Keep a tawa on the fire and put the crystals of
hing on it. Take a matka or an earthenware pot, and
as soon as the hing emits an aroma, turn the matka
upside down on the tawa to soak up the smell.
Take it off the fire and fill the pot with warm
water. Mix rai, salt, red chilli powder and whole
red chillies into the water. The fried vadas are now
put into the matka.
The top of the matka is covered with a clean muslin
cloth and securely tied.
The matka is left out in the sun during the day
for eight days. It is then ready to be served.