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1
Combine the rice vinegar, mirin, and soy sauce in a small bowl to form the sanbaizu. Stir until the mirin is fully incorporated. The dressing should read primarily sour on the palate, with sweetness and savour in support — taste and confirm this balance before proceeding.
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2
Toss the sliced cucumber with fine sea salt and set aside for a minimum of ten minutes — this is oshidashi. After ten minutes, squeeze the slices firmly in the hand: a visible flow of water must be expelled. Dry the slices on a cloth. The cucumber should feel limp but not broken, releasing no further liquid when pressed again.
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3
This is where the dish lives or dies: dress the cucumber, wakame, and surimi with the sanbaizu only at the moment of service. Pre-dressed sunomono weeps, the vinegar goes flat, and the dressing is diluted beyond recovery. The dressed ingredients must glisten with a thin, even coat of dressing and hold their form — no liquid pooling at the base of the vessel.
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4
Divide immediately into four small, elegant serving vessels. Scatter cold toasted sesame seeds over each portion at the last moment — heat destroys their fresh fragrance. The seeds should be audibly dry and crisp between the fingers before they leave the hand.