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1
Place the ground chicken, mushrooms, coconut oil, hoisin, soy sauce, garlic, sugar, vinegar, five spice powder, peppercorns, salt, and pepper in a bowl and gently knead to blend. Cover and refrigerate for at least 45 minutes and up to 1 day.
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2
Make the stock: Combine the chicken or vegetable stock, leeks, carrots, shiitake stems and celery in a medium-sized saucepan set over high heat and bring to a rolling boil. Reduce the heat to a simmer, and cook, uncovered, for 25 minutes. Strain through a fine mesh strainer into a bowl and set aside. You should have about 4 cups (see Kitchen Tip). This can be done up to 3 days in advance, and kept, covered, in the refrigerator.
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3
While the stock is cooking, make the dipping sauce: Combine the soy sauce, rice vinegar, hoisin sauce, and sesame oil in a small bowl and mix until thoroughly blended. Set aside until ready to serve.
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4
Make the potstickers: Line a rimmed baking sheet with parchment paper. Place a wrapper in the palm of your non-dominant hand. With your dominant hand, fill with 1 tablespoon of the chicken filling, and partially close the dumpling by bringing the sides together. With the filled wrapper still in the non-dominant hand, use your dominant hand to make pleats or pinch the dough shut. Set aside on prepared baking sheet. Repeat with the remaining wrappers and filling.
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5
Heat 11/2 tablespoons peanut oil in a large nonstick wok or saute pan with a lid over moderately high heat until hot but not smoking. Carefully place 6 to 8 dumplings, pleated sides up and sides not touching, into the hot oil. Cook for 30 seconds, or until the bottoms have lightly browned but not burned.
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6
Add 11/3 cups of chilled or lukewarm stock (enough to submerge the potstickers about halfway) to the pan, making sure to gently move the dumplings a smidgen to keep them from sticking. Cover and cook for about 10 minutes, or until the liquid is evaporated. Transfer the dumplings, crisp sides up, to a platter and keep warm. Repeat with remaining batches of dumplings, replenishing the oil as needed.
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7
Add the hot toasted sesame oil to the dipping sauce, if using, and serve immediately with the dumplings.