Start by washing the cucumbers. Cut off both ends and slice them in half lengthwise. Use a spoon to scoop out the seeds for a crunchier texture. Then, slice the cucumbers into thin half-moons.
Place the cucumber slices in a large mixing bowl and sprinkle with salt. Let them sit for about 10-15 minutes to draw out excess moisture.
While the cucumbers are resting, make the dressing. In a small bowl, combine the Korean red pepper flakes, sugar, rice vinegar, sesame oil, minced garlic, and optional chili powder. Mix well until the sugar is dissolved.
After the cucumbers have rested, rinse them under cold water and drain them thoroughly. Pat them dry with paper towels to remove excess moisture.
Add the drained cucumbers back into the mixing bowl. Pour the dressing over the cucumbers and toss gently to coat them evenly.
Add the chopped green onions and sprinkle the sesame seeds on top. Toss once more to mix everything together.
For the best flavor, let the salad sit for about 30 minutes in the refrigerator before serving to allow the flavors to meld.
Notes
For the best flavor, let the salad sit for about 30 minutes in the refrigerator before serving.