Sieve wheat flour, baking powder and baking soda 5-6 times and keep it ready.
In a bowl mix curd, jaggery and mix till it is melted.
Filter the mixture to remove any impurities
Then add oil and vanilla essence to it and mix.
Then add the flour in batches and mix gently without lumps
Next add water and mix.
Fold batter gently and mix. Batter should be dropping consistency.
Grease baking tin with butter/oil and line with parchment paper.
Fill the batter to ¾th of the tin and tap to release air.
Heat kadai, place plate in it and preheat for 6-8 minutes.
Then place the cake tin in the kadai.
Close it with lid and bake in low flame for 50 minutes till tooth pick inserted comes out clean.
Once cake cools down, remove the cake from tin.