1) Soak the uncooked rice in a separate bowl for 4 to 5 hours.
2) Soak Vigna mungo and Fenugreek seeds in a separate bowl for the same time as above
3) Grind igna mungo and Fenugreek seeds first by adding little water, make it as a paste
4) Than grind uncooked rice by adding little water to it, make it as a paste.
5) Mix both the paste together by adding rock salt in it, batter is ready.
6) Keep the batter outside or in sun (if weather is cold) for a day to ferment well.
7) Next day use the batter for Paniyaram
For Paniyaram
1) Take a pan, add oil, mustard seeds, curry leaves, chopped onions, green chilies and little salt (as salt will anyways be there in the idly batter as well).
2) Saute it well & than add coriander leaves to it.
3) Saute it again for 3 to 4 minutes & mix it with the idly batter.
4) Now the batter is ready. (as shown in the picture).
5) Now take the paniyaram vessel (as shown in the pic)
6) Add a drop of oil in each of the bowls & add this batter in them (as shown in the pic) keep it on low flame & cover for some time, so that it is cooked well.
7) After few minutes, you need to turn the paniyaram to the other side with the help of a stick shown in pic earlier (you can also use a spoon or a knife to turn), as both the sides need to be cooked well.