from A Year In A Vegetarian Kitchen by Jack Bishop
1. Bring 4 quarts water to a boil in a large pot for cooking the noodles. Add 1 tablespoon salt and the noodles and cook until al dente. Reserve 1/2 cup of the cooking water and drain the noodles. Toss the noodles with 1 tablespoon of the oil in a large bowl. Set aside.
2. Whisk the reserved cooking water, hoisin sauce, soy sauce, and rice wine together in a small bowl. Set the hoisin mixture aside.
3. Place the garlic, ginger, chile, and black beans, if using, in another small bowl. Set the aromatics aside.
4. Heat 1 tablespoon of the remaining oil in a large, deep nonstick skillet over medium-high heat until shimmering. Add the tofu and cook, stirring several times, until the cubes are golden on most sides, about 5 minutes. Transfer the tofu to a small bowl.
5. Add the greens and 1/2 cup water to the empty pan and stir-fry until the greens have wilted and the water has evaporated, about 1 minute.
6. Clear the center of the pan and spread the aromatics out over the empty spot in the pan. Drizzle the remaining 1 teaspoon oil over the aromatics and cook until fragrant, about 1 minute. Stir the aromatics into the greens to combine.
7. Add the noodles and hoisin mixture and use two forks to pull apart the noodles. Sitr-fry, continuing to pull the noodles apart, until they are hot and well-coated with sauce and greens, about 30 seconds. Add the tofu and toss with the noodles once or twice to distribute the tofu cubes and heat them up, about 30 seconds. Serve immediately.