Rinse rice and lentils and soak in water for about 2 to 3 hours.

Grind mixture in a blender, adding enough water to make a paste. Add salt and set aside to get sour for 12 hours.

Take idli plates and place a drop of oil in each idli mould and spread it over the entire mould.

Heat 2 cups of water in a large vessel or pressure cooker and place the filled idli plates and cover with lid. Cook on high heat for about 20 minutes.

Remove the plates from the vessel and remove the idlis.

Pour 2 teaspoons of sesame oil while serving.