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1
In dry heavy skillet over moderate heat, toast peppercorns, stirring, until fragrant, 3 to 5 minutes. Transfer to bowl and let cool, then grind in spice grinder to fine powder. Set aside.
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2
In large pot over moderately high heat, bring 4 cups water to boil. Add tofu, remove from heat, and let steep, uncovered, 5 minutes. Using slotted spoon, transfer tofu to medium bowl and set aside.
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3
In small bowl, whisk together hot bean paste, black-bean paste, 2 tablespoons oyster sauce, and chili powder. Set aside.
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4
In small bowl, whisk together cornstarch and 3 tablespoons water. Set aside.
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5
In wok or heavy large saute pan over moderate heat, heat oil until hot but not smoking. Add beef, ginger, garlic, and scallions and stir-fry until meat is browned, about 1 minute. Add rice wine and cook, stirring occasionally, until most of moisture evaporates, 1 to 2 minutes. Add hot bean paste mixture and cook, stirring occasionally, until mixture is incorporated and oil in pan turns red, about 1 minute.
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6
Add tofu, leeks, stock, light and dark soy sauces, and remaining 2 tablespoons oyster sauce and bring to boil. Whisk cornstarch mixture to recombine, then add to pan and cook, stirring occasionally, until juices thicken slightly, about 1 minute.
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7
Transfer to serving dish. Sprinkle with Sichuan peppercorn powder and cilantro, if using. Serve immediately.
