To marinate, in a bowl, combine the chicken, vinegar, soy sauce, and garlic and mix well, then marinate for at least 1 hour or overnight.
To pan-fry, in a pot over high heat, add the cooking oil and the chicken (reserve the marinade) and cook until lightly browned on both sides.
To braise, pour in the marinade, add the water, peppercorns, and bay leaves, bring to a simmer, and let it cook without stirring for a few minutes.
To simmer, reduce the heat to medium-low, cover, and cook for about 45 minutes until the chicken is tender and cooked through.
To reduce and serve, remove the lid and simmer for about 5 minutes until the sauce thickens slightly, making sure the chicken reaches 165°F (74°C), then serve hot with the sauce.