Divide your dough into 50-100 pieces. I make mine bigger so I get about 55 pieces as I make them about twice as big as the original recipe intended.
Make a tester, flatten out one of your dough pieces. Use a teaspoon to scoop some of your cooled filing and form it into a ball. This should be easily done but if your filling is too wet, it may be easier to work with an "irregular shape" and not try and form it into perfect balls.
Place your filling ball in the middle of your flattened out dough ball and encircle your filling with your dough carefully, rolling it in your hand to make sure there are no cracks.
Use the back of a knife to make cross hatching into your dough ball (about 3 line horizontal and 3 line vertical( , place on line parchment paper. Until your are ready to egg wash and bake.
After making your single tester, you can get a sense of how much filling your need in each tart.
You can start working efficiently by dividing up your filling ahead of time, filling your dough and forming them into circles and when all the filing is done, you can cross hatch on mass and egg wash all at once.
Preheat oven to 330 degrees before all your tarts are filled, and bake your tarts for 20-21 minutes. If you have make bigger tarts (closer to 60 tarts total rather than 100, you may want to bake for an addition 2-3 minutes.
It is important to have a tester baking sheet where you bake about 5 tarts and test out how they bake, and how quickly they brown in your oven.
When they are ready, let cool slightly, transfer to plate while you bake your others.
On the first day they are melt in your mouth butter and so tender. Pineapple tarts are said to do well with "aging". When they are fully cooled store them in an air tight container at room temp and as your continue to enjoy them over several days, your will notice a textural change. They become less crumbly but the flavour in the jam filling is more pronounced.