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1
Place the rinsed rice and water or light stock in a wide, heavy pot. Bring to a vigorous boil over high heat, then reduce to a steady simmer. Cook uncovered, stirring occasionally to prevent the rice settling and scorching on the base. The congee is ready when the grains have fully softened and burst open but the porridge remains loose, soupy, and pourable — not thick or starchy. This should read as a translucent gruel, not a paste.
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2
Taste the congee for seasoning. It should taste purely of rice and clean broth. Add no more than a pinch of salt if required. This is where the dish lives or dies: the congee must be deliberately thin and clean — any impulse toward richness, heaviness, or aggressive seasoning at this stage will erase the delicacy the dish exists to celebrate.
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3
Arrange the raw fish slices flat in individual warmed bowls. The fish must be sashimi-grade fresh; pre-cooking it at any earlier stage is not correct. Bring the pot of congee to a full, rolling boil.
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4
Ladle the boiling congee directly over the raw fish slices in each bowl. The heat of the porridge poaches the fish gently at the table. The fish is done when the slices have turned just opaque — pale and just set, not white and firm.
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5
Finish each bowl immediately with fried shallots, ginger strips, sliced spring onion, and a teaspoon of sesame oil. Serve with soy sauce and white pepper at the table for each diner to season to their own taste.