Combine soy sauce, peppercorns, garlic, and bay leaves in a large bowl. Stir.
1 tablespoon whole peppercorn, 8 cloves garlic, 1/4 cup soy sauce, 5 pieces dried bay leaves
Add the sliced chicken piece by piece. Make sure that the chicken gets coated with soy sauce. Cover the bowl and refrigerate for 3 hours to marinate the chicken.
2 lbs. chicken
Heat oil in a pot.
3 tablespoons cooking oil
Put the chicken pieces gently into the pot. Cook each side for 2 minutes.
2 lbs. chicken
Pour the remaining marinade into the pot. Add chicken broth (or water). Let boil. Cover the pot and cook in low heat for 10 minutes.
1 cup chicken broth
Pour the vinegar in the pot. Let the liquid re-boil. Continue simmering for 30 minutes.
1/2 cup white vinegar
Add the sugar. Continue to cook until the sauce reduces to your desired consistency.
1 teaspoon sugar
Serve with warm white rice.