Preheat the oven to 190 degrees Celsius and line a baking tray with baking paper.
In a mixing bowl, mix together the flour, baking powder, and sugar.
Add in the butter, cut into pieces, and rub the butter and flour mixture together with your hands to form a consistency similar to wet sand.
Warm up the milk slightly (on the stove or in the microwave) - it must not be hot! Set it aside and add in the vanilla and lemon juice. Stir slightly and leave aside for a few minutes.
Then add the milk mixture (slightly curdled to resemble buttermilk) to the flour mixture and mix together with a fork.
Add some flour onto a clean surface and turn out the dough onto it. combine the dough and form a thick circle.
*Do not overwork the dough
Cut out circles (I used a champagne glass with a 5 cm width). Do this until the dough is done. You will have nice thick circles now (this will mean high scones).
Place them on the baking tray and lightly glaze them with the beaten egg.
Bake the scones for 10 min (12 if they seem a bit underdone).
Once cooled slightly (because warm scones are the yummiest!) and enjoy!