Wash the dosa rice and soak in water for around 4 to 5 hours
Wash the poha or flattened rice and soak in water for around 2 hours
Drain the water from dosa rice and poha. In a mixer grinder, add the soaked rice in portions and blend. After the rice is fairly smooth, add portion of the soaked poha and grind to a fine paste. Repeat the process for the remaining batch.
For the final batch, add the grated coconut as well and the cooked rice and blend smooth.
Take around 1/4 cup of lukewarm water and add sugar. Now add the active dry yeast and gently mix. Let this mixture rest for 5 to 10 minutes till the yeast is activated. The sign of activation is the mixture becoming frothy and fluffy. If it does not become fluffy, discard the yeast and use a different lot as it is not activated.
Now mix the yeast mixture and coconut water to the ground batter and add half the amount of salt and mix well. Let this batter rest overnight or for 8 hours in a warm place for proper fermentation. Make sure to use a large vessel, so that there is ample space for the batter to rise, else the batter would overflow out of the vessel.
Once the batter is fermented, you would see that the batter would have become slightly thinner and aerated. This is a sign of good fermentation.
Now add the remaining salt for the batter and mix gently. Add some more water if required. The consistency of batter should be very flowy and thinner than the dosa batter. However do not make it too watery either.
Now heat the Aapam pan and pour a big ladle of the batter in the pan and by holding the handles on both sides, swirl the batter in 360 degree motion to spread the batter well in the pan. Finally the residual batter would settle to the centre which would turn fluffy on cooking.
Add a tiny amount of oil if you are using a cast iron pan. However if you are using non-stick this recipe does not require any oil for cooking. Cover the Aapam pan with a lid and cook on a medium flame for 2-3 minutes.
Open the lid and check if the corners have turned slightly brown and crisp and if you touch the centre it must not stick to hand. Remove carefully from the pan by releasing one side and then pulling the aapam using hand
Serve the Aapam hot with a side dish of your choice.