Prepare Pork: Julienne 4 oz. pork shoulder and blend with 1 tablespoon water until fully absorbed. Add a slight salt pinch, mix in 2 teaspoons vegetable oil, and 1 teaspoon cornstarch. Keep aside.
Ready Dry Ingredients: Halve and seed dried chilies before mincing. Hydrate dried lily flowers, wood ears, and shiitake mushrooms in separate bowls using 1 cup of water each for 1-2 hours. After hydration, proceed to slice the mushrooms, chop the wood ears, and halve the lily flowers post trimming their tough ends.
Prepare Tofu and Other Ingredients: Cut the spiced and firm tofu into strips measuring 2 inches in length and ¼ inch in thickness. Bamboo shoots should be julienned. In a small bowl, whip the egg until beaten. Scallions should be washed, chopped, and set aside for later.
Assemble Soup: Heat 8 cups of chicken stock to a boil. If pork has formed clumps, add a tablespoon of water to separate them before introducing into the stock. After adding pork, eliminate any surface foam using a fine mesh strainer. Add in salt, sugar, dried chili, white pepper, soy sauces, sesame oil, the prepared dry ingredients, tofu, and finally vinegar to merge flavors.
Thicken with Slurry: Mix ⅓ cup cornstarch with ¼ cup water to form a smooth slurry. While continuously stirring the soup in a circular motion, gradually incorporate the slurry to avoid lumps, stopping once the desired thickness is achieved that allows the soup to lightly coat the back of a spoon.
Season Perfectly: Fine-tune the soup’s flavor with additional white pepper for heat and more vinegar for sourness, based on personal preference.
Final Touch with Egg: With the soup at a gentle simmer, create a whirlpool motion using a ladle, then slowly pour in the beaten egg to form silky threads. Garnish with the previously chopped scallions and serve your hot and sour soup warm.