01 - Combine golden syrup, vegetable oil, and alkaline water in a mixing bowl. Whisk until the mixture is thoroughly blended and emulsified.
02 - Add flour to the wet mixture. Stir with a spatula until a soft, pliable dough forms. Cover tightly with plastic wrap and let rest at room temperature for 2 hours to allow the gluten to relax.
03 - Preheat oven to 350°F. Line a baking tray with parchment paper.
04 - Divide lotus seed paste into 12 equal portions (approximately 1.4 oz each). If using salted egg yolks, flatten each paste portion, place a yolk in the center, and enclose completely, rolling into smooth balls.
05 - Divide the rested dough into 12 equal portions (approximately 0.7 oz each). Keep covered to prevent drying.
06 - Flatten each dough ball into a thin disc. Place one filling ball in the center and carefully fold the dough edges upward, pinching to seal completely. Roll gently between palms to form a smooth sphere.
07 - Lightly dust the mooncake mold with flour. Place each filled ball into the mold, seam side up. Press firmly on a flat surface to imprint the design, then release onto the prepared baking tray.
08 - Bake for 5 minutes to set the structure. Remove from oven.
09 - Lightly brush the tops of each mooncake with the egg yolk and milk mixture, being careful not to fill the imprinted design.
10 - Return to oven and bake for 15–20 minutes, or until the pastry achieves a rich golden brown color.
11 - Transfer mooncakes to a wire rack and cool completely. Store in an airtight container at room temperature for 1–2 days before serving. This resting period allows the pastry to soften and develop the traditional tender texture.