Soak rice overnight. Next day grind it in a wet grinder or mixie till it is smooth and soft. The batter has to be thick. Mix salt in this thick batter, and steam it in idli steamer for 10 to 15 mins.
Once it is steamed, remove it from the idli steamer and take the sevai kattil, and put the steamed idlies in that and press to get fine rice noodles. Dont let the idlies cool, it should be pressed when it is hot. Thats it sevai done.
Now lets make the more kuzhambu. Take all the ingredients given for kuzhambu except curd and make it into a smooth puree. Set aside till use.
Now heat oil in a kadai. Add all the tempering ingredients in it. Saute it for a min.
Pour the ground coconut mix and some water, this kuzhambu has to be watery. Now mix this well and bring it to boil. Once it reaches boil, take it off the stove and pour it into a bowl. Add in curd and mix well. Mor kuzhambu done.
Now to make vathal, heat oil for deep frying, add in koozh vathal and fry till it is well fried. strain and set aside. Serve.