Prepare the Vegetables: Shred the cabbage and carrots using a sharp knife, mandoline slicer, or food processor. Thinly slice the scallions.
Make the Dressing: In a small bowl, whisk together the sesame oil, rice vinegar, soy sauce, honey (or sugar), ginger, garlic, and lime juice. Add sriracha or chili flakes for spice, if desired. Whisk until the honey or sugar is fully dissolved and the dressing is smooth.
Combine the Ingredients: In a large mixing bowl, add the shredded cabbage, carrots, and sliced scallions. Pour the dressing over the veggies and toss until everything is evenly coated.
Garnish and Serve: If desired, top the coleslaw with sesame seeds, chopped peanuts, or fresh cilantro. Serve immediately, or refrigerate for about 30 minutes to allow the flavors to meld.