Wash all the dals nicely in tap water 2-3 times.
Soak dal in enough water for at least 2-3 hrs. You can soak overnight also.
Soak poha in water 10-15 before making dosa. If using thin poha,soak just before adding it for grinding. Drain water and then add with dal.
When ready to make ,drain water from soaked dal.
Transfer to grinder/blender add about ½ Cup water, add ginger, green chillies, cumin seeds and salt. Grind to a smooth paste.
Batter should be smooth and not of very thin consistency.
To check the consistency of batter, dip a spoon in batter and take it out. It should coat nicely the back of spoon.
Keep the batter to rest for about 15-20 min.
Heat a griddle on medium flame. Splash some water. It should sizzle. Griddle is ready for making dosa,
Drop a ladle full of batter in griddle and immediately spread it in circular motion., just like crepes or pancake batter.
Drop oil or ghee, let it cook for a minute. The sides of dosa will start to leave once the dosa is cooked from bottom.
Flip it with the help of spatula and cook for few seconds from the other side also.
Serve hot with chutney or ketchup. Kids will love to have it with Aloo masala.