Take a bowl and add oil and grated or roughly crushed jaggery in it.
Mix them. No issues if you are finding difficulty in dissolving jaggery completely.
Add orange juice in the bowl. we have used the homemade fresh juice but you can use the store brought also. mix.
Now place a big sieve over the bowl and sieve whole wheat flour, baking powder, baking soda, salt and corn flour in it.
Add orange zest.
Mix them by using cut and fold method as shown in video, but don't overdo.
Transfer the mixture in a cake tin in which butter paper was already arranged and the tin was greased very well with oil.
Gently tap the cake tin so that excess air bubbles are released and surface of the batter becomes plain.
Transfer the cake tin in oven and bake in the middle rack of Oven for 40 to 45 minutes at 180°C with both the rods on. You can also bake it in microwave on convention mode.
Check the doneness by inserting a toothpick or knife in the cake and if the toothpick/knife comes out clean, it means your cake is ready.
Let then turn cool and thereafter invert on a plate.
Cut the cake into slices and it's a time to cherish....