Winter Melon Soup/Toong Kua Tong

Put pork ribs in the pressure cooker and put in enough water to cover the ribs. Bring it to the boil and conitinue to boil until all the scums rise to the surface. Remove all the ribs and wash away all the scums. Discard the water in the pressure cooker and wash preassure cooker really well. Cut winter melon into small cubes of 1″ (remove seeds and skin) Put cleaned ribs back to the pressure cooker together with the rest of the ingredients except the salt. Put in the water that mushrooms and dried octupus were soaked. Top up with more water until it is enough to cover the ingredients. Close the lid of the pressure cooker and pressurized for 30 - 45 minutes, counting from the time the pressure cooker starts hissing. Turn off heat when cooking time is over and let the pressure released by itself before opening the lid. Taste the soup before adding salt as tai tau choy can be very salty. Enjoy Serves