Vattayappam /Steamed Rice Cake

Vattayappam is a steamed rice cake which  is a Christmas delicacy in Kerala where I am from. But if you want to have a bit of Christmas all year round, you can still make this.This makes a delicious breakfast or an any time snack.
Wishing all my friends best of joy  and best of cheer!
Ingredients
Raw rice( Sona masoori)– 2 cups
Idlli rava– 1/2 cup ( Cooked  Rose matta /matta-1 and 1/2 cups)
Grated coconut/Thick coconut milk – 1 and 1/2 cup
Active dry yeast – 1 tsp
Sugar – 1 cup
Salt – a pinch
Roasted Cashews and Raisins – as needed (Optional)
Cardamom-  4 powdered
Method :
Soak the rice in water for 5-6 hours and drain it. Pressure cook idlli rava using one cup of water for 5 minutes or till cooked.  Grind one and half cups of this cooked idlli rava  with grated coconut,sugar and socked rice adding just enough water to a smooth batter.Be careful while adding water,the batter should not be very watery,it has to be in the consistency of dosa batter.Add the yeast and salt  to this batter and mix well .Cover it with a lid and keep it in a warm place for to ferment or till it doubles.I kept this in my oven with the light on and it doubled in 3 hours .
Add cardamom powder if you’re using and gently stir .Grease a flat pan or idly mould with little oil or butter and spoon in the fermented batter.Steam this for 15 minutes,if you're using cashew and raisin you can add them when its half done.