1. In a large skillet, heat the olive oil in a pan over medium-high heat. Once the oil is heated, add the ground chicken to the pan.
2. Cook the chicken thoroughly until it is reduced and browned.
3. Then, incorporate the diced onion, sesame oil, finely chopped fresh ginger, freshly minced garlic, rice wine vinegar, hoisin sauce, and soy sauce to your desired taste.
4. If desired, include Gochujang to add extra flavor. Stir the ingredients together to ensure even distribution.
5. Continue cooking until the sauce thickens. Once achieved, turn off the heat and carefully add 8 ounces of water to the mixture. Stir in the chopped chestnuts and fresh green onions.
6. After incorporating all the ingredients, serve the chicken filled and wrapped in fresh butter lettuce.
7. Store any leftover chicken it in an airtight container in the refrigerator. Reheat gently on the stove or microwave, and assemble with fresh lettuce leaves when ready to eat.
