Preheat the oven to 350 deg F.

In an un-greased pan, stir together flour, sugar, cocoa powder, baking powder, baking soda and salt.

Then add the butter, warm water, lemon juice and essence into the dry ingredients and mix it well using a fork.

Bake it for 35 minutes.

:- Remove it from the oven and place it on a wire rack to cool.