Preheat oven to 180°C. Using lightly oiled hands, roll out about a teaspoon of the pineapple jam into balls and place aside. Don't be tempted to make the balls of jam too big as they will overflow over the pastry.
Roll out the pastry dough to a 0.5cm thickness (pound coin) between two sheets of non stick baking sheet or use a lightly floured rolling pin. Remove the top sheet of paper and use your pineapple tart or cookie cutter mould to cut out shapes of your pastry. Use the handle of a wooden spoon to make a small circular dent in the middle. You can then either remove the excess dough and slide the baking paper with the pastry onto your baking tray or remove each cut piece and place it on a baking sheet.
Place the prepared balls of pineapple jam into the middle of each tart and place decorative pastry on top of jam if you want. Traditionally, small pieces if dough will be rolled out and placed as a cross across the jam. In this case, I used some star shaped sprinkles to match the cookie shape after the tarts were cooked.
Brush pastry with egg wash and bake on the top shelf of the oven for 15-20 minutes until the pastry is slightly golden. Cool on a wire rack to allow the pastry to crisp up and store in an airtight container.