Wash millet in several changes of water till it’s clear and transparent . Soak in 3 cups of water.
Washing the millets several times is a very important step, please do not skip that
In another bowl, wash the lentil well twice, soak in 1 cup of water along with the fenugreek seeds
Soak both these for 4-6 hours
Towards the end of the soak time, wash the poha / flattened rice well and soak for 30 mins in 1/4 cup of water till just moistened
If you are NOT using flattened rice / poha, soak 1/4 cup of sago / sabudana when you soak the Millet itself in a separate bowl and add the soak sago at this stage
Drain water from the soaked dal if any and reserve
In a wet grinder or a mixer grinder, add the soaked dal+ Methi seeds and grind to a very smooth paste adding the soaked water as needed in intervals. The batter should be smooth as butter. Transfer to a large bowl
In the same jar / wet grinder , add the drained millet and grind to a smooth paste
Towards the end of the millets grinding, add the soaked poha and grind further for 5 mins
Mix both the batters well with a clean hand, add salt and mix further . Cover and close the batter to ferment for 6 -8 hours or overnight
Next morning, the batter will be fluffy and airy, mix with a light hand
Pour 1-2 ladles on to a pre heated tava / skillet and do not spread too much,
Drizzle 1/4 tsp oil if using
Cover and cook the dosa for 1-2 min
Flip and cook for 30 seconds
Serve hot with any curry / sambar or chutney