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1
Wash the short-grain rice under cold running water until the water runs nearly clear. Cover with cold water and soak for 30 minutes, then drain completely in a sieve. The grains should appear white and opaque — they are ready to absorb the cooking liquid evenly.
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2
Measure the total cooking liquid: dashi plus seasoning (shoyu, sake, and mirin where the recipe calls for it) to exactly the volume of water the rice cooker or pot would otherwise require for 300 g of rice. Account for any liquid the seasonal ingredient will release — oyster liquor, crab broth, or corn milk must replace an equal volume of dashi, not supplement it. This calibration is where the dish lives or dies: flavoured liquid replaces water entirely; any excess leaves the rice waterlogged and the seasoning dilute.
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3
Place the drained rice in the rice cooker or heavy pot. Lay the prepared seasonal ingredient directly on top of the rice — bamboo shoot and abura-age strips for takenoko gohan; whole peeled chestnuts and sliced mushrooms for autumn variations; ginger and yellowtail trimmings for buri gohan; stripped corn kernels and the whole cob for tomorokoshi gohan. Do not stir. Pour the calibrated cooking liquid over all. The liquid should sit just at the surface of the rice and ingredient layer — no higher.
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4
Cook using the standard rice-cooker cycle, or on the stovetop: bring to a boil over medium heat, reduce to the lowest possible flame, cover tightly, and cook for 12 minutes. For tomorokoshi gohan, the cob will be visible above the liquid; this is correct — it steams while the rice absorbs below. The smell of seasoned dashi rising from the pot is the signal that absorption is progressing.
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5
When the cooking cycle completes, do not lift the lid and do not stir. Rest, covered, for 10 to 15 minutes. During this phase, add any delicate ingredients: pre-cooked crab meat, fresh oysters (which will gently steam through in the residual heat), or shelled edamame. Replace the lid immediately after adding them. The steam within the pot is finishing the dish — breaking the seal now causes uneven texture throughout.
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6
Remove the corn cob if present. Using a wide, flat rice paddle (shamoji), fold the rice from the outside edge inward with two or three deliberate cuts — do not stir. Every grain should carry colour from the cooking liquid and be distinct, not clumped. The abura-age, where used, will have absorbed the seasoned dashi and softened entirely into the rice. Taste a single grain: it should be seasoned through to its centre.