1. Heat oil in a pan and add the mustard seeds and chana dal. 2. Once the mustard seeds pop and the chana dal starts turning golden brown, add the hing and cashews. Fry until the cashews start turning golden brown.
  2. Now add the rava and fry till it turns golden brown (a lot of golden-brown-turning needs to happen in this recipe), approximately 5-7 mins.  Add salt (regular, not eno), mix well, and let it cool.
  3. Then add 1 cup of curds to the dry mixture and mix well. Let it rest covered for 10 mins. Add the rest of the curds and mix well ( it should be little thicker than idli batter). Add the Eno fruit salt and mix well. Ladle the batter into idli moulds. Steam in an idli maker or pressure cooker for 10-12 mins (without weight). Allow it to cool and unmould.