Cook couscous as directed on package.
Meanwhile, slice cabbage into thin strips; dice pepper and red onion; grate carrots; chop cilantro, green onions, and cashews; and drain and rinse chickpeas. Add all to a large mixing bowl.
Allow couscous to cool for about 10 minutes, then drain, rinse, and add to the veggies.
Scoop peanut butter into a mixing bowl and add remaining dressing ingredients; whisk together well and then add to veggies. Toss to coat evenly.
Squeeze with fresh lime juice to taste, and top with mandarin oranges before serving.