Sift the flour, cocoa powder, and baking soda for even mixing.
Keep it in a wide bowl after sifting.
In another bowl, add the oil, cold water, orange juice, vanilla essence, and lemon juice, and add the sugar and mix gently till the sugar dissolves.
When done, slowly transfer the wet mixture to the sifted flour and mix gently without any lumps.
If adding chocolate chips add at this stage.
Preheat the oven to 180 degrees C and arrange the muffin tray with muffin liners.
Spoon the batter and bake for 12- 15 minutes.
Mine got done in 12 minutes.
Check with a clean toothpick by inserting it in the middle of the muffin whether it is done or not. If it comes out clean then take it out and cool it on a wire rack and if not just bake it for a minute or two.