Rinse and soak the green moong dal in water for 6–8 hours or overnight.
Drain the soaked dal and transfer it to a blender.
Add ginger, green chili (if using), cumin seeds, turmeric, salt, and about ½ cup water.
Blend into a smooth, slightly thick batter. Add water gradually if needed.
Pour the batter into a bowl and let it rest for 10 minutes.
Stir in chopped onions and coriander leaves if using.
Heat a non-stick pan or tawa over medium heat and lightly grease with oil.
Pour a ladle of batter onto the pan and gently spread in a circular motion.
Drizzle a few drops of oil around the edges.
Cook for 2–3 minutes until golden, then flip and cook the other side until fully done.
Repeat with remaining batter.
Serve hot with Green Chutney Recipe or yogurt.