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1
If using salted-packed mozuku, submerge in cold water and rinse briefly — one or two changes of water at most. If using fresh spring mozuku, a single gentle rinse suffices. Over-rinsing strips the seaweed of its delicate natural flavour. The mozuku is ready when it smells clean and oceanic, with no harshness of salt.
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2
Combine the rice vinegar, cold dashi, mirin, and soy sauce in a small bowl. Stir until fully integrated. Taste: the dressing must be lightly sweet-sour, with no single element dominant. If the acidity is harsh, it will overwhelm mozuku's delicate nature — this balance is where the dish lives or dies.
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3
Drain the mozuku thoroughly and, if required, blanch for exactly 5 seconds in barely simmering water, then transfer immediately to iced water. Extended heat renders the texture unpleasantly slimy rather than pleasantly slippery. Drain again and shake dry.
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4
Divide the mozuku into four small bowls or deep dishes. Arrange the cucumber julienne and ginger over each portion. Pour the dressing over evenly — approximately 3 tablespoons per portion.
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5
Refrigerate until thoroughly cold before serving. Cold temperature is essential: it amplifies the refreshing oceanic quality and firms the characteristic slip of the fucoidan strands. The seaweed should glisten and hold its fine thread-like form without matting.