Marinade chicken with soy sauce and garlic. (I use a 9-minute marinator so it's pretty quick for me. If you don't have the gadget, you can just marinate the chicken for 2 hours).
In a wok, add cooking oil and put the wok into medium heat.
Add marinated chicken and water. Bring to a boil.
Add bay leaves, whole peppercorn and potatoes. Simmer for 30 minutes.
Add vinegar. Stir and cook for 10 minutes.
Add sugar and salt to taste.
Serve and enjoy!
Inspired by Panlasang Pinoy