Step 6: Cook noodles in a small pot of boiling salted water until al dente. Drain and run under cold water to stop cooking. Toss with oil in a large bowl. Add mango, arugula, watercress, carrots, scallions, cabbage, tomatoes, and dressing and toss to coat. Season with salt if desired. Add steak, avocado, cilantro, basil, mint, coconut flakes, and ¼ cup peanuts. Gently toss just to combine.