Make dressing: In a medium bowl, whisk together ginger, lime zest, lime juice, vinegar, salt, and pepper. Whisking constantly, add oil in a steady stream until mixture is emulsified; set aside.
Bring a large saucepan of water to a boil. Add noodles, and cook until al dente according to package instructions, about 6 minutes. Drain in a colander, and transfer noodles to a serving bowl.
Add dressing, scallions, and peanuts to noodles; toss to combine. Serve warm, at room temperature, or chilled, and garnish with additional scallions and peanuts.
Oops. Meant to say soba noodles. They are NOT somen.
The noodles pictured on this page are actually somen noodles. Just a heads up!