To make set dosa recipe, wash rice and soak in ample water for about 5 hours.
Wash and soak urad dal and fenugreek seeds in ample water for about 5 hours.
Wash poha just before grinding the batter.
Add urad dal, salt, fenugreek seeds and aval to a blender jar along with 1 cup water and blend till bubbly. if needed add more water to grind the batter smooth. Do not add too much water, batter should not be very runny.
Transfer the batter to a large bowl.
Add rice to the jar along with ¼ cup water. Grind to a smooth batter.
Pour this to the urad dal batter. Mix everything well till well combined.
Set aside in a warm place for 8 to 12 hours for the batter to ferment and rise well.
Heat a tawa, mix the batter gently.
Pour one ladle full of batter and dab it gently to spread the batter don not spread like a normal dosa. add oil across the edges.
Cover and cook for a while until the dosa is cooked inside. you can flip and cook it for a minute on the inner side as well.
To get a crusty dosa, lower the flame and cook for a while.
Sprinkle spice powder and serve hot with chutney
Repeat making more set dosa on the tawa.