Cook the pasta: Cook the pasta according to package directions until al dente. Drain and rinse under cold water until completely cooled. Drain well and set aside.
Prepare the vegetables: Thinly slice the red cabbage, shred the carrots, dice the red bell pepper, slice the green onions, and chop the cilantro. Drain the mandarin oranges and thaw the edamame if using frozen.
Make the miso dressing: Whisk together the miso paste, rice vinegar, soy sauce, sesame oil, honey, ginger, and garlic.
Toss the salad: Add the pasta to a large bowl and top with all of the other salad ingredients. Pour the dressing over the salad and toss until evenly coated
Chill and serve: Cover and refrigerate for at least 30 minutes before serving. Garnish with additional almonds, green onions, or cilantro if desired.