Whisk together the butter and the regular sugar until fluffy.
Add the eggs, one by one, and mix until creamy, then add the vanilla, buttermilk and lemon juice and mix.
Add the food colouring and mix well.
In a separate bowl, combine all the dry ingredients together (flour, salt, baking powder, baking soda, cocoa). Add the dry ingredients over the red mix and incorporate. Add the chocolate chips and fold them in the mix. Cover the dough in cling film and refrigerate for at least 1 hr.
Take the dough out of the fridge. Use a spoon or an ice cream scoop to take equal amounts of dough and form balls with your palms.
Put the powdered sugar in a bowl. Cover all the cookie balls in icing sugar, then place the cookies on a baking tray covered with baking paper. if you want flatter cookies, flatten the balls with your palms.
Bake the cookies in the pre-heated oven at 175°C for about 15 minutes, or until they grow and crack. Allow them to cool on the baking tray.