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Cut the cucumber lengthwise into 1/4-inch pieces and cut each piece in half then cut the halves lengthwise into thin strips.
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Place them into a bowl and set aside.
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Place the soy sauce, mirin, rice vinegar and sugar into a small container with a secure lid.
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Put the lid on and shake to create the vinaigrette dressing.
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Pour the dressing over the cucumber and toss to coat.
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Cover and marinate for 1 hour, stirring once or twice.
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Just before serving, sprinkle the toasted sesame seeds on top.