Prep the Chicken Feet: Prepare the chicken feet. Trim the nails, rinse thoroughly, and boil for 3-5 minutes to remove impurities. Drain and set aside.
Fry for Flavor: Heat oil in a pot. Fry the chicken feet until light brown. Set aside.
Sauté Aromatics: In the same pot, heat 2 tbsp oil. Sauté garlic and onion until fragrant and soft.
Simmer the Adobo: Add fried chicken feet, soy sauce, water, whole peppercorns, sugar, and potatoes. Bring to a boil, then lower heat and simmer for 20–30 minutes until chicken feet and potatoes are tender. Add water if needed.
Add Vinegar: Pour in vinegar but do not stir. Let it cook for 5 minutes uncovered to mellow the sharpness.
Final Touches: Stir everything together. Add oyster sauce, long green chilies, and red chili. Season with salt and pepper. Simmer 2–3 more minutes until the flavors combine.
Serve & Enjoy: Transfer to a plate and serve hot with steamed rice or as pulutan.