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1
Soak the dried wood ear mushrooms and lily buds separately in cold water until fully rehydrated and pliable. Trim the woody stems from the wood ear and shred; remove the hard tips from the lily buds and tear each in two. Cut the tofu into fine strips and shred the pork to a similar dimension. All components should be uniform so they cook at the same rate — the prep is done when every element is cut and ready.
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2
Bring the stock to a full boil in a medium pot. Add the shredded pork, separating the strands as they go in. Add the wood ear mushroom and lily buds. Return to a boil and simmer briefly until the pork has lost all pink colour — the signal that the aromatics have begun to exchange with the broth.
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3
Add the tofu strips and the soy sauce. Stir the cornstarch-and-cold-water slurry once more to recombine it, then pour it into the simmering broth in a slow, steady stream while stirring continuously. The soup is ready to receive the egg when it has thickened to a consistency that coats the back of a spoon lightly — not gluey, not thin.
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4
This is where the dish lives or dies. Hold the beaten eggs above the pot and pour them in the thinnest possible stream while stirring the soup in one continuous circular motion. The current of the broth sets the egg instantly into long, silky ribbons. If the stream is too thick or the stirring stops, the egg scrambles into clumps and the characteristic texture is lost — the ribbons must be distinct, fine, and suspended throughout.
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5
Remove the pot from the heat. Add the Chinkiang vinegar and ground white pepper only now — prolonged heat dulls the vinegar's complexity and flattens the pepper's penetrating quality. Stir once. Taste: the soup should carry a sharp, immediate sourness and a deep, warming heat that builds at the back of the palate rather than on the tongue.
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6
Ladle into bowls and drizzle each portion with toasted sesame oil. Serve immediately, with extra Chinkiang vinegar and ground white pepper on the table for each diner to adjust.