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1
Toast the pine nuts and sunflower seeds in a large skillet over medium heat until golden, shaking the pan regularly. Add the sesame seeds to the pan and toast for a minute or so. It's hard to tell when they are toasted; look closely and use your nose. Remove from the heat as soon as you smell a hint of toasted sesame; if you let them go much beyond that, you'll start smelling burned sesame - not good. Transfer to a mortar and pestle and crush the mixture; the texture should be like black sand. Alternatively, you can use a food processor. Stir in the sugar, shoyu, mirin, sesame oil, brown rice vinegar, and cayenne pepper. Taste and adjust if needed.
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2
Bring a large pot of water to a boil. Salt generously, add the soba, and cook according to the package instructions until tender. Drain, reserving some of the noodle cooking water, and rinse under cold running water.
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3
While the noodles are cooking, drain the tofu, pat it dry, and cut into matchstick shapes. Season the tofu with a pinch of salt, toss with a small amount of oil, and cook in a large skillet over medium-high heat for a few minutes, tossing every couple minutes, until the pieces are browned on all sides.
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4
Reserve a heaping tablespoon of the sesame paste, then thin the rest with 1/3 cup / 80 ml of the hot noodle water. In a large mixing bowl, combine the soba, half of the green onions, and the black sesame paste. Toss until well combined. Add the tofu and toss again gently. Serve topped with a tiny dollop of the reserved sesame paste and the remaining green onions.
