Wash the millet and soak them in about 3 cups of water for four hours.
Wash the lentils and soak them in 2 1/2 cups of water for four hours.
After 4 hours, grind them to a fine batter. You will not need extra water to grind it. But if you do, please add it. Ensure that the batter is neither too thick nor too thin.
Whisk it well for a minute. Then cover and keep it for overnight fermentation.
The next day, add salt, cumin seeds, crushed curry leaves and crushed black pepper and mix well.
Add water and bring the batter to a flowy consistency.
Heat a pan. Grease it. On medium heat, spread the dosa batter. Keep it as thin as possible.
Drizzle some ghee/oil around the edge and also on the dosa and cook on medium heat.
If you have spread the batter thin, you don't need to flip it. If you see that the surface of the dosa on top looks a bit raw, flip it for a few seconds and take out the dosa.
Serve hot with any chutney of your choice.