2. Practice: Wash the pears with clear water and cut them into large pieces. Pay attention to connecting the pear skins together and don't throw them away. Cut Sydney into pots for use. Add 2000 grams of water to the pot. After the water is boiled, first cook the tremella with medium heat for 10 minutes, and then add other ingredients (remember that the ratio of pear to water is 1 2). Cook on low heat 1 hour, and cook for about one third.