Sauce: 2 tsps Custard powder, 100ml Drinking water, Lemon juice (1 Lemon), 1/2 Lemon (zest only), 3-4 tbsps Red sugar.

• 芡汁：吉士粉2茶匙、白开水100毫升、柠檬汁1份、柠檬1/2个(只要皮)、红糖3-4汤匙。