Step 1. Wash and soak Rettai Kili rice poha and urd dal separately for 4-5 hours.
Step 2. Drain and blend in a blender together with salt and poha till smooth.
Step 3. Transfer the batter in a big vessel and cover and keep to ferment for 6-8 hours.
Step 4. Grease the idli molds and pour the batter in each mold.
Step 5. Steam the idlies for 15-20 minutes, till done.