Start by cleaning your chicken feet. Using a sharp knife or kitchen shears, trim off the nails and any dark, callused areas. Scrub the feet thoroughly with rock salt, then rinse well with cold water.
Fill a large pot with water and add your cleaned chicken feet along with ginger slices and knotted green onion stalks. Bring to a boil and cook for 7-10 minutes, occasionally removing any scum that rises to the surface. Drain the feet and pat them completely dry with paper towels.
Heat cooking oil in a deep pot until it reaches 350°F (180°C). Carefully add the dried chicken feet and fry them for 3-4 minutes until they turn light golden brown. Remove from oil and immediately plunge them into a bowl of ice-cold water. Let them soak for one hour until the skin becomes wrinkled. Drain well.
In a clean, large pan, heat one tablespoon of oil over medium heat. Add your chopped onions and minced garlic, cooking until they become soft and fragrant. Add the chicken feet to the pan.
Pour in the vinegar, soy sauce, and one cup of water. Add your peppercorns, bay leaves, and chili peppers. Let it boil without stirring for 2-3 minutes. This step is important - don't stir yet!
Lower the heat, cover the pan, and let it simmer for 50-60 minutes. Check occasionally, and if the sauce is drying out before the feet are tender, add water in half-cup portions as needed. You'll know they're done when the meat easily comes off the bone.
Add the oyster sauce and salt to taste. Stir everything together and cook for a final 1-2 minutes. Your Adobong Paa ng Manok is now ready to serve hot with steaming rice.
Remember: The sauce will naturally thicken and become jelly-like when it cools - this is normal and comes from the natural collagen in the chicken feet. When reheating leftovers, simply add a splash of water and warm slowly over medium-low heat.