Cake dough

Put the dry ingredients in a bowl and mix by hand.

Cut the butter into small cubes and put it in the bowl. Then rub the butter with all the ingredients until you have a crumbly dough.

Add part of the beaten egg and knead to a dough ball. The ball must feel smooth. If it's too dry, add some egg when it's too wet, you'll add some flour.

Make a ball, wrap in foil and put away to cool. At least an hour.