In a shallow bowl mix together vinegar, soy sauce, garlic, bay leaves, peppercorns and maple syrup. Add chicken and let marinate for 1-3 hours.
Drain the chicken, reserving the marinade. Heat up a pan with just enough oil to coat the bottom., brown the chicken in the hot pan about 3 minutes per side.
Add the reserve marinade back into the pan. If using a chili pepper add that in. Simmer the chicken in marinade uncovered until it almost completely reduces, about 15-20 minutes, more if needed. The chicken will be dark and glazed.
Serve with green onions.
