Sift the dry ingredients (cake flour,sugar,salt) in a bowl

Add butter (soft texture) and whisked egg. Use your clean hand to crumb it gently

After it mix together then put on the plastic wrap and make a shape then put it into freezer about 10-20mins to set it up

Take it out from the freezer and use a stick to make it flat about 1 inch thick. Cut a shape that fit with your mold.

Before put into the oven, use a fork to poke holes at the surface of the pie. After that put it into your preheated oven (200°c 10mins) and bake it with 200°c and 15mins

Meanwhile, take a clean lemon and get the lemon zest on it then rub with sugar

Cut the lemon and get the juice into a small bowl then mix all ingredients together except butter

Put the filling ingredients to a pot with medium low heat and keep stirring it until slightly thick

Pour it into a bowl then add butter until it become smooth

Pour the filling (still warm) into the pie that completely cool then put it into the refrigerator to set. Then it's done!