Sieve all purpose flour, corn flour, baking soda, baking powder, and cocoa powder in a bowl and mix it.
Take another bowl and mix butter, oil, sugar, and milk and beat well.
Add lemon juice and 1 tablespoon water.
Then go on adding sieved dry ingredients little by little.
lastly, add 1 teaspoon vinegar and 1/2 teaspoon water and mix thoroughly.
ladle the batter into a preheated waffle iron.
Cook the waffles until golden and crisp.
