Sometimes the skin is rubbed with malt sugar to give it an amber colour and is then hung up to air dry before roasting in the oven.

有时厨师会给鸭皮抹上饴糖使它变成琥珀色，在放入烤炉烘烤之前还需要把鸭子挂在空气中干燥。

youdao

Then they rubbed the clothes on flat pieces of wood, squeezed out the water and hung each piece to dry.

VOA: special.2010.03.28

Sometimes the skin is rubbed with malt sugar to give it an amber colour and is then hung up to air dry before roasting in the oven.

BBC: Sampling Beijing��s imperial duck