Ingredients : 1/2 cup whole wheat flour,1/2 cup ragi flour, 1/4 tsp baking soda,3/4 tsp baking powder,1/2 tbsp Bournvita powder ( I did not have cocoa & so I used Bournvita ),salt to taste.
3 medium sized ripe bananas-all mashed & pureed,1/2 cup jaggery sugar( this is almost chocolate colour - ordinary white sugar can be used),1/4 cup yoghurt,2 tbsp oil,1 tbsp vinegar.
Method :In a bowl,mix banana puree,oil,sugar & yoghurt nicely till sugar dissolves.Add vinegar & mix nicely.Keep aside.
In another bowl, mix all dry ingredients by sifting the flours ,Bournvita powder baking powder & baking soda.Make a well in the dry ingredient mix & slowly pour the banana puree oil-vinegar-sugar mix .Mix nicely into a batter so that no lumps remain.Add water, if batter is too thick.It must have drop down consistency.Keep aside.
Take a microwaveavble vessel & line the bottom with butter paper.Pour the cake batter into this vessel.Microwave for 7-8 minutes till a toothpik inserted comes out clean.
Let the vessel be in microwave for 10 minutes.Then take it out from microwave.Cool outside the microwave for another 10 minutes.Put the vessel upside down on to a plate.It will take some time before the cake drops down on to the plate.Then cut it into desired shapes & serve.
My cake turned out very moist & the wonderful aroma of bananas.Sugar content was just right.Jaggery sugar is very sweet -hence I used only 1/2 cup.It can be increased if more sweetness is needed.