Chinese
Rinse the duck, pat dry, and rub the cavity with salt, five-spice, and Shaoxing wine.
Loosen the skin from the meat, then pour boiling water over the skin to tighten it; pat dry.
Mix maltose and vinegar with a little hot water and brush over the whole skin.
Hang the duck in a cool, airy place or refrigerate uncovered for at least 8 hours until the skin is dry and taut.
Roast breast-up at 180 C for about 75-90 minutes, until the skin is deep mahogany and crisp.
Rest 10 minutes, then carve the crackling skin and meat into thin slices.
Warm the pancakes, spread with hoisin, add duck, spring onion, and cucumber, then roll and serve.