Mix the ingredients of the yeast proofing together and keep aside for 15 mins so that yeast starts to act.
In the meanwhile, grind rice in a mixer, adding water, just enough to operate the mixer. When ground rice reaches a coarse texture, remove the required quantity mentioned under the heading To Make Thari Kurukku/Rice porridgeand keep aside. Now add freshly grated coconut to the main batch of ground rice and grind thoroughly to a fine batter. Towards the end, add cooked rice and grind again.
Make the Thari Kurukku/Rice porridge by heating a pan and coarse ground rice taken out from the above mixture , add water and bring it to a boil. Keep stirring in low heat until it is fully cooked and reaches the consistency of a thick paste /porridge. I used a egg beater for stirring it to avoid the formation of lumps.
After the porridge cools down add it to the ground batter and give it one more whiz in the mixer. Mix the yeast mixture in it and keep aside for about 4 hours or till it doubles in volume in a large container.
After 4 hours add the sugar and cardamom powder to it and leave aside for 1 hour again.
Heat the ghee in a small pan and roast the nuts in it.
Add the batter to a well greased pan (I greased it with ghee too) and just before putting it for steaming sprinkle the nuts on the top.
Steam for about 15-20 mins till done (mine took about 18 mins)
Let it cool down completely before you take it out and after than well enjoy.