In a medium bowl, combine soy sauce, honey, rice vinegar, minced garlic, and grated ginger to make the teriyaki sauce.
Heat the sesame oil in a large skillet over medium-high heat. Add the diced chicken thighs and cook until browned, about 5-7 minutes.
Pour the teriyaki sauce over the cooked chicken, stirring to coat evenly. Cook for an additional 3-4 minutes, until the chicken is fully cooked and the sauce has thickened slightly.
Add the diced red bell pepper and water chestnuts to the chicken mixture. Cook for another 2-3 minutes until the vegetables are tender-crisp.
Remove from heat and stir in chopped green onions.
To serve, scoop a generous amount of the chicken mixture onto a butter lettuce leaf, wrap it up, and enjoy!
Sprinkle sesame seeds on top for added flavor and texture.