To Prep
In a bowl, combine golden syrup, oil and alkaline water using a spatula. Cover with cling film and set aside for 1 hour.
In a separate bowl, combine flour and sodium bicarbonate, then sift in to the bowl in Step 1.
Mix to form dough. If dough is too sticky, add an extra 1 to 2 tbsp of flour.
Cover with cling film and rest it for another hour before filling and shaping.
Divide dough into equal portions – weight to depend on the size of your mooncake biscuit mould. Roll each portion into a ball.
Press the ball of dough into a lightly floured mooncake mould. Use your palm to press the ball into the mould, and make sure the edges are flattened as well. Invert the mould and knock a couple of times to dislodge mooncake biscuits.
To Cook
Place biscuits on greased trays. Bake at 160°C for 10 mins. Remove and brush with egg wash. Bake for another 10 mins or until golden brown.
Remove from oven and cool biscuits on wire rack. When cooled, store mooncake biscuits in an airtight container for a couple of days before consuming. The texture improves over time as the oils within softens the mooncake biscuits.