Boil green onion, white ginger slices, brown sugar and water. No need to peel the onion. There are many nutrients in the skin of onions. When making soup, you should peel them less or not to avoid the loss of nutrients. The correct way to boil brown sugar, green onion and white ginger water is to take two clean white sections of green onions, two large slices of unpeeled ginger, a large bowl of water and bring to a boil over high heat, simmer over low heat for ten minutes, then add a tablespoon of brown sugar and simmer for another two minutes. Can.