sentence: slice 3 scallions sentence: slice one cup of bamboo shoots sentence: soak 1 ounce of mushroom in 11/2 cup of boiling water sentence: slice the mushrooms and save the leftover water sentence: cut 7 ounces of tofu into  inch cubes sentence: add the mushroom and the leftover water to 5 cups of boiling chicken stock sentence: add 4tbsp of soya sauce 1 tbsp of white pepper and simmer for five min sentence: add the scallions bamboo shoots and the tofu and simmer for five min sentence: mix 2 tbsp of cornstarch with 4 tbsp of cold water in a bowl sentence: add the cornstarch mix to the soup while whisking it sentence: add 3 tbsp of vinegar sentence: add 1 beaten egg to the soup while stirring sentence: sprinkle with scallion greens