01 - Preheat oven to 350°F. Line a baking tray with parchment paper.
02 - In a bowl, combine golden syrup, vegetable oil, and alkaline water. Stir until smooth.
03 - Add flour to the wet ingredients and mix into a soft dough. Cover and let rest for 30 minutes.
04 - Divide lotus seed paste into 12 equal portions (about 1.4 ounces each). Place one salted egg yolk in the center of each paste ball and shape into a ball.
05 - Divide rested dough into 12 equal pieces (about 0.9 ounces each).
06 - Flatten a piece of dough 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. Place into a floured mooncake mold and press gently to shape. Invert to release onto the baking tray.
08 - Bake for 5 minutes, then remove and let cool for 10 minutes.
09 - Mix egg yolk and water for the glaze. Brush a thin 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. Store in an airtight container for 1–2 days to allow the skin to soften before serving.