In a large bowl, combine the green cabbage, red cabbage, carrots, green onions, red bell pepper, and cilantro.
In a separate bowl, whisk together the soy sauce, rice vinegar, sesame oil, honey, ginger, garlic, and sesame seeds until well blended.
Pour the dressing over the cabbage mixture and toss until all the vegetables are evenly coated.
Let the slaw sit for at least 15 minutes to allow the flavors to meld. For best results, refrigerate for 30 minutes before serving.
Serve chilled or at room temperature.