Wash the cucumbers thoroughly and slice them thinly into rounds, around 1/8-inch thick.

Place the cucumber slices in a colander and sprinkle them with 1 teaspoon of salt. Toss gently to coat and let sit for 10 minutes to draw out excess water.

Rinse the cucumber slices under cold water to remove excess salt and pat them dry using paper towels.

In a small bowl, whisk together rice vinegar, soy sauce, sesame oil, sugar, and grated ginger until the sugar is dissolved.

Transfer the cucumber slices to a serving bowl and pour the dressing over them. Toss gently to coat the cucumbers evenly.

Sprinkle toasted sesame seeds on top and garnish with finely sliced green onion if desired.

Serve immediately or chill in the refrigerator for 10-15 minutes before serving for enhanced flavor.