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1
Combine the dashi with the soy sauce, sake, and mirin. Taste: the seasoned liquid should read lighter than the intended final flavour of the dish, as it will concentrate fully as the rice absorbs it during cooking. Adjust — err on the side of restraint.
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2
Prepare all solid ingredients by cutting them small enough to cook evenly within the standard rice-cooking time. Estimate the moisture the ingredients will release during cooking and reduce the measured dashi volume by that amount before combining with the rice.
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3
Place the drained raw rice in the rice cooker or heavy pot. Pour the seasoned dashi over the rice. Arrange the prepared ingredients on top of the rice in a single, even layer. Do not stir. The rice below should be fully submerged in the liquid and the ingredients should sit undisturbed on the surface — this is where the dish lives or dies: disturbing the arrangement or opening the lid at any point during cooking destroys the steam environment that simultaneously cooks the rice and infuses the ingredients' essences down through the grains.
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4
Cook with the lid closed. If using a rice cooker, engage the standard rice cycle. If using a pot on the stove, bring to a boil over medium heat, then reduce to the lowest possible heat until all liquid is absorbed. The lid must not be opened at any point during cooking.
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5
When the cooking cycle is complete, switch the heat fully off and allow the rice to rest, lid on, for 15 minutes. During this rest, residual steam continues to work through the rice. The pot will be silent.
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6
Remove the lid. The surface should show distinct, separate grains with no pooled liquid remaining and no wet sheen. Using a shamoji (rice paddle), fold the rice gently from the bottom upward — do not stir. For matsutake gohan, place the briefly sautéed reserved matsutake on top of each portion at this moment.