01 - Preheat oven to 350°F. Line a baking tray with parchment paper.
02 - Combine golden syrup, vegetable oil, and alkaline water in a bowl. Stir until smooth and well incorporated.
03 - Add flour to the wet ingredients and mix into a soft, pliable dough. Cover and let rest for 30 minutes.
04 - Divide lotus seed paste into 12 equal portions (approximately 1.5 ounces each). Encase one salted egg yolk in the center of each paste ball and shape into smooth spheres.
05 - Divide the rested dough into 12 equal pieces (approximately 0.9 ounces each).
06 - Flatten a dough piece into a disc. Place a filling ball in the center and wrap the dough around it, sealing completely. Repeat for all portions.
07 - Lightly dust each ball with flour. Press into a floured mooncake mold, then invert to release onto the prepared baking tray.
08 - Bake for 5 minutes, then remove from oven and let cool for 10 minutes.
09 - Whisk egg yolk and water for the glaze. Brush a thin, even layer over the mooncakes.
10 - Return mooncakes to the oven and bake for an additional 15-20 minutes, or until golden brown.
11 - Cool completely on a wire rack. Store in an airtight container for 1-2 days to allow the skin to soften before serving.