Cook rava with 2 glasses of water till it becomes soft & loose. Let it cool. Add 1/4 glass of lukewarm water to yeast & 1/2 teaspoon sugar. Allow it to rise.Ground the coconut with enough water & keep aside. Take 2 cups rice flour in a vessel, add rava & mix well. Add yeast & mix well. Add gounded coconut & mix well. Make sure that the batter is not too loose . It should have a medium consistency. Keep it for 3 hours. After 3 hours add 1/2 cup sugar ( more sugar can be added if required ) & salt & stir well. Apply a liitle ghee/oil in a cake tin & pour the batter into it.Put some raisins on the the top. Steam it for 20 – 25 minutes.