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1
Combine the dashi, soy sauce, mirin, and sake in a wide, shallow saucepan. Bring to a gentle simmer over medium heat. Taste the tare at this point: it should read as slightly too assertive — more sweet and more salty than seems comfortable — since the rice will dilute it considerably. Adjust if either element is absent.
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2
Add the sliced onion to the simmering tare. Cook over medium heat, uncovered, until the onion is fully translucent and tender but has taken on no colour. The onion must not caramelise — caramelisation introduces a competing sweetness that overwhelms the tare's calibrated balance. The surface of the liquid will still be pale and clear.
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3
Lay the thin-sliced beef across the surface of the tare in a single loose layer. This is where the dish lives or dies: the beef simmers for 2–3 minutes only. The moment the slices lose their raw colour and the edges just begin to curl, remove the pan from the heat. The residual heat of the sauce and the rice will complete the cooking. Overcooking at this stage destroys the silky texture that defines quality gyūdon.
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4
Portion the hot rice into four deep bowls, filling each bowl to roughly two-thirds. Ladle the beef and onion over the rice, distributing both evenly. Spoon enough tare over each bowl so that it pools visibly at the join of topping and rice — the upper rice should be saturated with sauce, while the rice at the base remains comparatively dry. This gradient from sauced top to dry base is the defining donburi eating experience.
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5
If serving tsukimi-style, place one raw egg yolk at the centre of the beef on each bowl immediately before serving. Add beni shōga to the side of the bowl if using. Serve at once — gyūdon waits for no one; the sauce continues to move into the rice from the moment of assembly.