Take a pan and dry roast vermicelli on medium heat till they are light brown.
Take them out in a mixing bowl. In the same pan add 2 tsp of ghee and add both the dals.
Roast them for few seconds and add cashew and peanuts. Stir and roast them till they are light brown in color.
Now add curry leaves stir well and add mustard seeds. When mustard seeds crackle add suji.
Roast suji till it gets light pink then transfer the mixture in bowl also add roasted vermicelli to it.
Let the mixture cool down completely. When mixture is cold add curd , salt and mix well .
To this add water and mix it. Cover the bowl and let it rest for 20 minutes. After 20 minutes grease idli mold with oil.
Heat the steamer. Add eno fruit salt to batter and mix thoroughly. Transfer the mixture in idli molds.
Steam idlis for 12-15 minutes. After 12-15 switch off the steamer take out the idli mold.
Let it rest for few minutes. Take semiya rava idli out.