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1
Keep the tofu in the refrigerator until the moment of plating. If using silken tofu in a sealed tub, upend the tub onto a rimmed plate and unmould cleanly to present a cold cylinder. If using block tofu, drain thoroughly and cut into a neat slab. The tofu must be cold to the touch — this thermal contrast is half the dish.
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2
Soak the dried shrimp in cold water for 10 minutes. Drain and press lightly dry. Set aside. They should yield slightly when pressed but retain a distinct firmness — if still hard and chalky, soak a further 5 minutes.
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3
Combine the chili oil (with its sediment), soy sauce, sesame oil, and minced garlic in a small bowl. Add Chinkiang vinegar if using. Stir to integrate. Taste: the dressing should be fiery, numbing, deeply savoury, and sharp from the raw garlic. The chili oil is the primary flavour — if it reads thin or flat, the dish cannot recover. This is where the dish lives or dies.
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4
Pour the dressing over the cold tofu in a slow, circular motion from the outside edge inward, ensuring even coverage across the entire surface.
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5
Scatter the soaked dried shrimp evenly over the dressed tofu, then finish with the sliced spring onion. The surface should show a vivid red gloss of chili oil broken by the pale green of spring onion and the small, amber fragments of shrimp.
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6
Serve immediately, while the tofu remains cold. The correct sensory experience is cold, creamy tofu against the concentrated heat and numbing quality of the dressing.