Step 1

Fit a colander or fine-mesh strainer over a large bowl. Using a spiralizer with the thinnest "noodle" attachment, spiralize the cucumber into long, thin strands. Place in the colander, sprinkle with the 1/2 teaspoon salt, and toss to combine. Let the noodles stand 30 minutes at room temperature.

Step 2

Meanwhile, whisk together the vinegar, sesame oil, and sugar in a large mixing bowl until the sugar is dissolved.

Step 3

When the noodles are ready, add them to the dressing and gently toss to coat. Taste and season with more salt as needed. Sprinkle with toasted sesame seeds if using and serve immediately.