Boil whole chicken in big casserole with onion, celery and peppercorns. Cover with just enough water. When cooked through, remove meat from bone and save the stock. Heat oil in a pan (or wok if possible). Sautee garlic and onion slices until the onion is transparent. Add chicken and pork. Cook until pork is brown. Add half of the chicken stock. Boil for about three minutes. Add salt, soy sauce and patis to taste. Also sprinkle some ground black pepper. Simmer for about another three minutes. Add shrimps, mushrooms, carrots and other ingredients except the noodles. Simmer for another 3 minutes or so covered. Add the remaining stock. Adjust the taste with salt, pepper, patis and soy sauce. Add the noodles. Mix thoroughly until noodles are soft.