Make the lemon curd ahead of time per the instructions above.
Preheat the oven to 200 degrees C (392 degrees F).
Unroll the pastry sheet, cut it into 8 equal rectangles and arrange it on a large baking tray lined with the parchment paper that comes with the puff pastry (no waste needed).
Score a 1cm (a bit less than half an inch) border around the edge of each rectangle and pierce the middles all over with a fork.
Take a pastry brush and brush all over the rectangles with a little milk and scatter all over with 2 tbsp of the granulated sugar.
Bake for about 15 minutes or until golden brown.
Gently press down on the middles of each cooled tart shell (use the back of a fork or a spoon).
Let them cool down completely.
Meanwhile, wash and hull the strawberries.
Slice the strawberries into quarters if larger or, if you have lots of small strawberries, cut them into halves.
In a medium bowl, mix the lemon juice with 1 tbsp of the remaining granulated sugar. Toss in the strawberries and set aside.
In a large mixing bowl, mix the mascarpone with 1 tbsp of powdered sugar and 1 tbsp of milk.
Add 1 tbsp of the creamy lemon curd to each tart shell and spread it in the middle.
On top of the lemon curd, add 1 tbsp of the mascarpone cheese mixture.
Layer the strawberry slices on top of the tart.
Pour a bit of the strawberry liquid that's left from the strawberry mixture on each tartlet.
Sprinkle a bit of lemon zest (optional).
Serve and enjoy!