Take a bowl ,add cocoa powder and add lukewarm water and whisk it properly (try to avoid lumps)
Now take another bowl add flour and baking soda and sieve it once.
Now add sugar and salt in the dry ingredients and mix them well.
Preheat the oven at 200 degree Celsius for 10 minutes.
Now make a well in the center of these dry ingredients and add the cocoa water mix ,oil and vanilla essence .
Whisk till it gets smooth. Now add vinegar and whisk again.
After this transfer the batter in a cake tin by greasing it with some oil and bake it for 30 to 40 minutes at 180 degree Celsius.
Once the cake is baked ,check it with a skewer and place the cake on a wire wrack for around 15 to 20 minutes.(be patient)
After the cake cools down take it out from the tin and cut it into slices.
Enjoy your veg chocolate cake .
