Preheat the oven at 180° C
Shift flour, salt, baking powder and baking soda together 3-4 times .
Now add coconut , half walnut and half chocochips in it and mix well.
Now in a separate bowl take banana , mash it with help of a fork.
Now add jaggery, oil, sprig vanilla essence and mix well .
Add dry and wet ingredients together . Add soda water and make thick batter.
Now remove 1/2 cup batter and add cocoa powder in it.
Now pour first batter in greased and lined pan . Now pour cocoa batter over it here and there.
Now make zig zag pattern using a tooth pick.
Sprinkle choco chips, walnuts and coconut all over it.
Tap the pan to release bubbles.
Place in preheated oven and bake for 35-40 mins or till skewer inserted in its middle comes out clean.
Enjoy the delicious tea cake with your cup of tea/coffee.