Boil the wheat noodles in water until soft. Meanwhile, let's prepare the tofu and sauce.
Cut the tofu into triangles. In a pan over medium to high heat, add the oil, soy sauce, and tofu. Place the lid on top of the pan or else it will get messy. Let the tofu pan-fry for about 4 minutes on each side or until it gets golden and crispy.
For the peanut sauce, whisk together the peanut butter, wasabi paste, soy sauce, and water until smooth. You can add more water to thin it out or more peanut butter to thicken it up.
Once the noodles are soft, drain them and toss the noodles in the peanut sauce, serve them with the tofu. Sprinkle the roasted peanuts and sliced scallions on top and enjoy!