Wash, peel the skin of beetroot and chopped into small pieces.
Take a jar and put chopped beetroot and grind into a smooth paste without adding water. Beetroot paste is ready.
Now put the paste of beetroot in a strainer and keep a bowl under the strainer to collect the liquid. Now take out the liquid by pressing it with the spoon. Beetroot juice is ready.
Take a bowl and add butter, sugar and mix well using a whisk.
Now add condensed milk and again mix it well for a few seconds by using a whisk.
Take another bowl and add all the dry ingredients- all-purpose flour, soda, baking powder in a bowl and mix it well. You can also add 1 tbsp. of cocoa powder (optional) at this stage only.
Now put ½ of the beetroot juice with wet ingredients and gradually put ½ of the flour mixture into the bowl of wet ingredients and mix well.
Now put rest of the flour mixture, beetroot juice and red gel food color, vanilla essence and mix it well. Lastly, add lemon juice and mix it well again.
If the mixture is thick then add water as needed and make the medium thick batter.
Pre-heat the oven at 180 degree Celsius and line a muffin tray with paper or foil liners.
Now fill 3/4 cup of liners with batter. Do not fill too much as it will become fluffy after baking.
Put the muffin tray in a pre-heated oven and bake it in convection mode at 180 degree Celsius for 15-20 minutes or till a knife/toothpick inserted into the cake comes out clean.
Check the cake with a toothpick, the toothpick should come out clean. If the toothpick is sticky then keep it in an oven and bake for some more time.
Red velvet cupcakes are ready. Frost with whipped cream when cool.