Heat oil over medium-high heat. Sear the pork until browned on both sides. Remove and set aside.
Sear the chicken until lightly golden, about 3 minutes per side. Remove and set aside. Wipe out excess oil.
Sauté garlic until fragrant. Add peppercorns and cook 30 seconds more.
Return pork to the pan. Add vinegar, water, fish sauce, sugar, and bay leaves. Mix and bring to a boil. Cover and simmer over medium heat for 30 minutes.
Add chicken and simmer for another 30 minutes, until both meats are tender. Add some water if the sauce gets too low.
Add green chilies and cook about 5 minutes.
Taste the sauce and adjust. Spoon some sauce over the meat, then turn off the heat.
Notes
Chicken: Use bone-in thighs or legs for best flavor. Avoid chicken breast asit dries out fast.
Pork: You can use pork belly or pork shoulder.
Vinegar: Coconut or cane vinegar gives the best flavor. White or apple cider vinegar works if needed.
Green chilies (optional): Add the chilies whole so they don't overpower the dish.
Storage
Refrigerate: Let cool, then store in an airtight container for up to 4 days.
Reheat: Warm on the stove over low heat or in the microwave. Add a splash of water if needed.
Freeze: Freeze in freezer-safe containers for up to 2 months. Thaw overnight in the fridge before reheating.