This is a big-deal dish. But the numerous steps, all easy, transform the duck into a wonder of subtle spiciness. We had this dish in Xi'an, where five-spice powder in the rub and the dipping salt were lovely touches.
02Heat peppercorn salt and five-spice powder in a dry skillet over moderate heat, stirring, until hot. Measure out 3 tablespoons and rub 1 tablespoon in body cavity and 2 tablespoons over outside of duck, including under wings and legs. Reserve remaining spiced salt for serving with duck.
03Put duck in a bowl and marinate, covered and chilled, 8 to 24 hours.
04Drain any liquid from cavity and put duck in glass pie plate. Rub rice wine over duck. Smash ginger and scallions with flat side of a large heavy knife, then put one third in duck cavity and scatter remainder over duck.
05Fill wok with enough water for rack to sit 1/2 inch above water and bring to a rolling boil. Wearing oven mitts, put pie plate with duck on rack over boiling water and cover wok with lid.
06Reduce heat to moderate and steam duck 2 hours, checking every half hour to siphon off fat and juices from around duck and in cavity with bulb baster and replenishing boiling water as necessary.
07Wearing oven mitts, remove pie plate from steamer. Discard ginger and scallions. Drain duck and cool in pie plate 15 minutes.
08Slide duck onto a rack set over a baking sheet (to catch juices) and pat dry with paper towels. Position duck in front of a fan and air-dry 2 hours, making sure air blows directly onto duck.
09Heat 2‚ inches oil in large wok or large pot until a deep-fat thermometer registers 375°F. Meanwhile, brush outside of duck with soy sauce, then dust with flour, gently knocking off excess.
10Dip mesh spoons in hot oil (to keep duck from sticking) before using them to gently lower duck into hot oil. Fry duck, spooning hot oil over top, 2 minutes. Carefully turn duck over and fry 1 minute more. With extreme care, remove duck from oil with mesh spoons, draining cavity, and transfer to paper towels to drain.
11Heat oil to 400°F and fry duck a second time, in same manner, until dark brown and crisp, 30 seconds to 1 minute on each side. Again with extreme care, remove duck from oil with mesh spoons, draining cavity, and transfer to paper towels to drain briefly.
12Serve duck with small dishes of reserved spiced salt for dipping.