Heat a pan adding 2 cups of water. Add salt. Bring it to rolling boil. Stirring continuously add fine rava.
Mix the rava in water such that no lumps are formed. Cook it for 2 to 3 minutes until all water is absorbed and mixture becomes thick. Transfer it to a plate and let it slightly cool down.
Next, grease some oil to palm and knead the rava mixture. Divide it in to two portions. Fill in a portion in to shavige (idiyappam) press.
On idli plate, press the shavige like small idlis. Place all the plates in a steamer and cook for 5 to 10 minutes. Let them cool down completely.
Next heat a pan add oil, mustard seeds, lentils, curry leaves. Saute till the mustard sizzle. Include peanuts, cashews, slit green chillies, turmeric powder and continue sauteing few more minutes. Adjust salt now.
Next, break the shavige in to this tempering pan and give a nice mix. Squeeze lemon and garnish with coconut and coriander leaves. Instant lemon sevai is ready to serve.