01 - Combine golden syrup, vegetable oil, and alkaline water in a bowl. Mix until completely blended and emulsified.
02 - Add flour to the wet mixture. Stir until a cohesive dough forms. Cover with plastic wrap and let rest for 2 hours at room temperature.
03 - Preheat oven to 350°F.
04 - Divide lotus seed paste into 12 equal portions (approximately 1.4 oz each). Wrap each salted egg yolk inside a portion of paste and roll into smooth balls.
05 - Divide rested dough into 12 equal portions (approximately 0.7 oz each).
06 - Flatten each dough ball into a disc. Place a filling ball in center and carefully wrap dough around, pinching edges to seal completely.
07 - Lightly dust mooncake mold with flour. Place filled ball inside and press firmly to imprint design. Release onto parchment-lined baking tray.
08 - Bake for 5 minutes. Remove from oven.
09 - Brush mooncakes lightly with egg yolk and milk mixture.
10 - Return to oven and bake for 15-20 minutes until golden brown.
11 - Cool completely on wire rack. Store in airtight container for 1-2 days to allow pastry to soften before serving.