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1
Rinse the rice in several changes of cold water, working it gently with the hand, until the water is nearly clear. Combine with measured cold water in a heavy pot with a tight-fitting lid. Bring to a vigorous boil over high heat, reduce to the lowest possible flame, and cook covered for 12 minutes without lifting the lid. Remove from heat and rest, still covered, for 10 minutes. The rice is done when the grains are fully swollen, glossy, and separate cleanly from the pot wall with a light press of the spatula.
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2
Warm the dashi in a saucepan over medium heat to just below a simmer. Add the soaked, drained wakame and the tofu cubes; heat through for 2 minutes without boiling. Remove from heat. Dissolve the miso paste in a ladleful of the hot dashi, stirring until smooth, then return to the pot and stir gently. Do not boil after the miso is added. Ladle into lacquered bowls immediately. The soup is ready when it releases a deep, savoury aroma with no raw-paste edge.
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3
Salt the mackerel fillets on both sides and allow them to rest at room temperature for 10 minutes; the salt draws surface moisture, which is then patted dry. This step — the correct salting and drying of the fish before heat — is where the saba shioyaki teishoku lives or dies: under-salted fish produces flat flavour; undried skin will steam rather than char on the grill. Preheat a grill or broiler to high. Cook skin-side toward the heat source for 3–4 minutes until the skin blisters and chars at the edges, then turn and cook the flesh side for 2 minutes. The fillet is done when the flesh separates into large, opaque flakes along its natural divisions when pressed lightly at the thickest point.
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4
Arrange the tray according to established teishoku convention: a bowl of steamed rice at the left front, the bowl of miso soup at the right front, the grilled fish on a plate at the centre-back, and the tsukemono in a small dish to the side. All elements are set simultaneously so the diner may begin their own rhythm of rotation between components at once. The tray is correctly set when each component occupies its designated position and no element obscures another.