1. Heat oil in a large skillet over medium high heat.
2. Add onion and sauté for 3 minutes.
3. Add chicken and cook, stirring for about 10 minutes, until browned on all sides.
4. Stir in garlic, celery, and carrots, and cook for 3 minutes.
5. Pour in sriracha, coconut aminos, and honey, and stir until the sauce is thickened and the chicken is coated.
6. Remove from heat and garnish with sesame seeds and green onions.
7. Serve in lettuce leaves.