Part 1: Making the Sweet Shortcrust Pastry

1. 1. Combine Dry Ingredients: In a large bowl, whisk together the all-purpose flour, icing sugar, and salt. This ensures the dry ingredients are evenly distributed before adding the butter.

1. 1. Incorporate Cold Butter: Add the cold, cubed butter to the flour mixture. Using your fingertips or a pastry blender, rub or cut the butter into the flour until the mixture resembles coarse breadcrumbs. The mixture should still have some small pieces of butter visible – this is crucial for flakiness. Work quickly to prevent the butter from melting.

1. 1. Add Egg Yolk: Make a well in the center of the flour-butter mixture and add the egg yolk. Mix it in briefly with a fork.

1. 1. Add Ice Water Gradually: Gradually add ice water, one tablespoon at a time, mixing gently with a fork after each addition. Continue adding ice water until the dough just comes together in a shaggy mass. Be careful not to add too much water, as this can make the dough tough.

1. 1. Form Dough Disc: Turn the dough out onto a lightly floured surface. Gently bring the dough together into a disc shape. Do not knead the dough; overworking it will develop gluten and make the pastry tough.

1. 1. Chill Dough: Wrap the dough disc tightly in plastic wrap and flatten it slightly. Refrigerate for at least 1 hour, or preferably 2 hours, to allow the gluten to relax and the butter to firm up. Chilling is essential for a tender and flaky crust.

Part 2: Preparing the Egg Custard Filling

1. 1. Dissolve Sugar in Hot Water: In a medium bowl, combine the granulated sugar and hot water. Stir until the sugar is completely dissolved. Ensure no sugar granules remain.

1. 1. Whisk in Evaporated Milk: Add the evaporated milk to the sugar-water mixture and whisk to combine.

1. 1. Whisk in Eggs and Vanilla: In a separate bowl, lightly whisk the eggs until just combined (do not over-whisk, as this can create air bubbles in the custard). Gradually whisk the eggs into the milk mixture. Stir in the vanilla extract and a pinch of salt.

1. 1. Strain Custard (Important): Strain the custard mixture through a fine-mesh sieve into a clean bowl. This step is crucial for removing any lumps or air bubbles, ensuring a perfectly smooth and silky custard. Discard any solids left in the sieve.

1. 1. Rest Custard (Optional but Recommended): Cover the strained custard with plastic wrap, pressing the plastic wrap directly onto the surface of the custard to prevent a skin from forming. Refrigerate for at least 30 minutes, or up to 2 hours. Resting allows any remaining air bubbles to rise to the surface and dissipate, and also allows the custard to slightly thicken, making it easier to pour into the tart shells.

Part 3: Assembling and Baking the Hong Kong Egg Tarts

1. 1. Preheat Oven and Prepare Tart Tins: Preheat your oven to 375°F (190°C). Lightly grease 12 standard muffin tins or Hong Kong Egg Tart tins (if you have them).

1. 1. Roll Out Pastry: Remove the chilled pastry dough from the refrigerator. On a lightly floured surface, roll out the dough to about ⅛ inch thickness.

1. 1. Cut Out Pastry Circles: Using a round cutter (approximately 4-inch diameter) or a knife, cut out pastry circles. You may need to re-roll scraps to get 12 circles.

1. 1. Line Tart Tins: Gently press each pastry circle into a tart tin, carefully shaping it to fit the bottom and sides. Ensure the pastry is evenly distributed and there are no thick or thin spots. You can trim any excess pastry hanging over the edges with a knife or scissors.

1. 1. Pour in Custard Filling: Remove the custard from the refrigerator. Gently whisk it again briefly. Pour the strained egg custard filling into each pastry-lined tart tin, filling them almost to the top, leaving a small gap at the rim.

1. 1. Bake: Bake in the preheated oven for 20-25 minutes, or until the pastry is golden brown and the custard is just set with a slight jiggle in the center. The custard should be puffed slightly and have a delicate golden hue. Avoid overbaking, as this can make the custard dry and rubbery.

1. 1. Cool and Serve: Remove the baked egg tarts from the oven and let them cool in the muffin tins for a few minutes before carefully transferring them to a wire rack to cool completely. Hong Kong Egg Tarts are delicious served warm or at room temperature.