These are soft and spiced idlis traditionally offered to the deity at Varadharajar temple in Kanchipuram. They are now a very popular dish in Tamilnadu and are served at most restaurants.
Take the measured quantities of the rice and dal. Wash and soak both the rice together and the urad dal and methi together.
In a wet grinder first, grind the urad dal to a fluffy batter. When it is almost done add the rice and grind them all together to a mildly coarse batter.
Transfer to a sufficiently big-sized vessel, add salt and let it ferment overnight or for 6-8 hours in a warm place.
The next day crush the pepper and cumin in a motor and pestle and chop the curry leaves finely.
Add this to the batter with the sesame oil, hing and ginger powder. Add more salt if needed.
Heat up the steamer. Grease the tumblers with oil and line them with banana leaves. Pour batter up to ⅔rd of the tumblers and steam for 10-12 minutes.
Check doneness by inserting a tooth pic. Let it cool for some time before demolding.
Serve with any chutney, veg, or non-veg curries of your choice.