Varadharaja Perumal Temple or Hastagiri or Attiyuran is a famous Hindu temple dedicated to Lord Vishnu located in the holy city of Kanchipuram, Tamilnadu, India.

Kanchipuram Idli(Steamed Rice Cake) is a special prasadam available in that temple. It is a huge Idli(Steamed Rice Cake) which is added with spices..The idli batter is poured in kudalai,  a shallow bamboo basket and then steamed.
Ingredients:
parboiled rice-1 cup
raw rice-1 cup
red gram-3/4 cup(thuvar dal)
Blackgram-1 cup
fenugreek-1 spoon
gingelly oil-1 cup
dry ginger powder-1 spoon
pepper powder-1 spoon
Method:
Soak the ingredients separately for 8 hours and grind coarsely.
Add a cup of gingelly oil and mix with the batter. It will be ready for steaming after 10 hours.
Before steaming add dry ginger powder and pepper powder.

The idlis can be steamed in the idli steamer as we do for the regular idlis .

There is another way of steaming this. Place a plantain leaf on rice cooker separator and pour the batter. Steam for 15 minutes in the rice cooker (without putting the weight valve) and then cut in to square pieces

The idlis can be poured in to greased cups or tumblers.  Then steam them using the steamer vessel or pour water in to a big kadai,keep the cups and close it with a lid that will cover the kadai. Steam it for 15 minutes.