01 -
Stir sugar and corn flour together in a bowl. Add egg, fresh lemon juice, and lemon skin. Cook using water bath, always stirring for 10 minutes till thick. Mix in butter till it melts away. Let it cool down, put a cover on top, and chill for 30 minutes. Then cut into 10 same-size bits and stick in freezer for 1 hour.
02 -
Mix soft butter with sugar, lemon skin bits, and vanilla till it looks puffy and light. Add egg and keep mixing till it's all blended. Slowly fold flour, salt, and baking powder just until mixed together. Put the mix in the fridge for 20 minutes.
03 -
Grab bits of cold dough and push flat into circles. Drop a frozen lemon filling bit right in the middle of each flat circle. Fold the dough around the filling, making sure it's totally covered up. Roll each ball in regular sugar and put them on a tray with room between them.
04 -
Stick them in a hot oven at 350°F for about 8-9 minutes, just until the sides start looking golden.