Ingredients:

• Cocoa Powder: 3 tbsp
• Whole Wheat Flour: 1 cup
• Baking Soda: ½ tsp 
• Lemon Juice/white vinegar/apple cider vinegar: 1tbsp 
• Edible oil: ¼ cup
• Vanilla powder/vanilla extract: ½ tsp 
• Water/milk: 1 cup
• Sugar: ¾ cup 
• Salt: 1 pinch

How to cook: 

Grease the baking pan with oil. Sieve the flour and cocoa powder. Add a pinch of salt and baking soda to the mix and keep it aside. In another bowl, add cold water to sugar and stir it still the latter dissolves completely. Now, add oil to this and stir it well. Add lemon juice to this mixture and stir again. Add vanilla extract to this and stir again. Add the flour + cocoa + salt mixture to this and mix well. Make sure that the batter is thin, without lumps. Bake it for around 40 minutes in a preheated oven (at 200 degrees Celsius), and your cake is ready.