Preheat the oven to 200 ℃.
Remove a pastry disc from the fridge and, on a lightly floured work surface, roll out to about 5 mm thick.
Use a 9 cm cutter to cut the pastry into rounds.
Place the rounds into the cups of a 12-cup muffin pan.
Spoon a heaping teaspoon of the sauce into each of the cups.
Reroll leftover pastry and use a 7 cm cutter (See Recipe Note 1) to cut smaller rounds. Place a smaller round on top of each tart.
Place a smaller round on top of each tart.
Repeat the above with the other disc of pastry.
Brush the tarts with beaten egg and sprinkle with granulated sugar.
Bake for about 20 - 25 minutes or until the pastry has lightly browned.
Remove from oven and let cool in the pan for about 15 minutes before removing to a wire rack to cool completely.