1) For dressing, zest orange to measure 1 tsp zest, juice orange to measure 2 tbsp juice. Place zest, juice, vinegar, oil, honey, cilantro and salt into a small bowl. Mix thoroughly and set aside.
2) For slaw, cut cabbage half into 2 equal portions. Carefully, slice cabbage into thin shreds. Peel carrots and cut into julienne strips. Cut bell peppers into thin strips. Cut off white parts of green onions and reserve for another use. Slice green onion tops into thin, short strips. Place vegetables in a large bowl.
3) When ready to serve, pour dressing over slaw; toss. Serve immediately.