Begin by thoroughly washing the cucumbers. Cut off both ends and slice each cucumber in half lengthwise. Using a spoon, gently scoop out the seeds to achieve a crunchier texture. Then, slice the cucumbers into thin half-moon shapes.
Transfer the cucumber slices into a large mixing bowl. Sprinkle them with salt and allow them to rest for about 10-15 minutes. This process helps to draw out excess moisture from the cucumbers.
While the cucumbers are resting, prepare the dressing. In a small bowl, mix together the Korean red pepper flakes, sugar, rice vinegar, sesame oil, minced garlic, and optional chili powder. Stir well until the sugar is dissolved and the mixture is well combined.
Once the cucumbers have finished resting, rinse them under cold running water to remove excess salt and drain them thoroughly. Use paper towels to pat them dry, ensuring they are not too wet.
Return the drained cucumbers to the mixing bowl. Pour the prepared dressing over the cucumbers and toss them gently to ensure an even coating.
Incorporate the finely chopped green onions into the salad, and sprinkle the sesame seeds on top. Give everything a final gentle toss to mix thoroughly.
For optimal flavor, refrigerate the salad for about 30 minutes before serving. This allows the flavors to meld and develop, creating a more delightful dish.
Notes
Serve in a chilled glass bowl and garnish with extra sesame seeds and cucumber slices.