Pre-heat oven to 400F (200C). Grease and flour an 8 inch springform pie pan. Or line a non springform pan with parchment paper.
Roll out the puff pastry*, cut a circle about 2 inches larger than the pie plate , the remaining two inch circle cut in two down the middle then cut each half circle in two, cutting circular. You will have 4 strips. (see photos) Place the circle in the prepared pie pan, refrigerate while slicing the apples.
In a small bowl mix together the brown sugar and cinnamon. set aside.
Remove the core from the apple, but do not peel. Cut into quarters and be sure to make thin slices, place in a bowl as you cut and toss with a little lemon juice (it keeps the apples from browning).
Remove the pastry from the fridge and brush it with milk and prick the bottom with a fork. Roll the apple slices in the cinnamon mixture, then place them around the boarder, then add a strip of pastry around the apple slices and continue until you reach the middle. You can finish the middle with a puff pastry rose (which is just a strip of puff pastry rolled up). It's a good idea to chill the pie in the fridge while the oven is pre-heating approximately 15-20 minutes.
Bake at 400F (200C) for 15 minutes then lower the temperature to 350F (180C) for approximately 15 minutes or until golden. Let cool to warm or serve room temperature, serve. Enjoy!
*If you can't find puff pastry large enough then two round will work perfectly.