Prepare the Vegetables:
In a large bowl, combine the shredded red cabbage, shredded green cabbage, grated carrot, sliced red bell pepper, and shredded daikon (if using). Toss everything together to evenly distribute the colors and textures.
Make the Ginger Sesame Dressing:
In a small bowl, whisk together the sesame oil, rice vinegar, honey, soy sauce, grated ginger, minced garlic, Dijon mustard, and a pinch of salt and pepper. Taste and adjust the seasoning if needed, adding more honey for sweetness or more soy sauce for saltiness.
Toss the Slaw:
Pour the ginger sesame dressing over the prepared vegetables and toss until the slaw is well coated.
Garnish and Serve:
Sprinkle sesame seeds and fresh cilantro over the top of the slaw for extra flavor and color. Serve immediately, or refrigerate for 30 minutes to let the flavors marinate.