Make the sauce. In a small bowl, whisk together soy sauce, rice vinegar, sesame oil, sriracha, and honey.
Set aside.
Brown the turkey. Heat oil in a large skillet over medium-high. Add ground turkey, season with a pinch of salt and pepper, and cook, breaking it up, until no longer pink, 4–6 minutes.
Add aromatics. Stir in onion, garlic, ginger, and the white parts of the green onions. Cook until fragrant and the onion softens, 2–3 minutes.
Stir in veggies. Add bell pepper (if using) and the coleslaw mix.
Toss well and cook, stirring often, until the cabbage is tender-crisp, about 4–6 minutes. Avoid overcooking so it stays a bit crunchy.
Sauce it up. Pour the sauce over the mixture. Toss to coat and let it simmer for 1–2 minutes so the flavors come together.
Taste and adjust salt, pepper, and heat.
Finish and serve. Remove from heat. Top with the green parts of the green onions and sesame seeds. Serve alone, over rice or cauliflower rice, or in crisp lettuce cups.
Add a squeeze of lime if you like.