1. Start by slicing the English cucumbers thinly. Aim for uniform slices, about a quarter of an inch thick. This way, each bite will be deliciously crunchy.
2. Next, take the red onion and slice it thinly as well. The key here is to cut it into pieces that are small enough to blend well with the cucumbers.
3. Now, chop the green onion finely. This ingredient will add a fresh flavor and a nice color contrast to the salad.
4. In a large mixing bowl, combine all your sliced and chopped veggies: the cucumbers, red onions, and green onions. Gently toss them together to mix.
5. For the dressing, grab a small jar or bowl. Add the rice vinegar, white sugar, sesame oil, crushed red pepper flakes, and salt. Seal the jar or whisk together until the sugar dissolves completely.
6. Now, pour the dressing over the veggie mixture in the bowl. Toss everything gently, making sure the vegetables are evenly coated with the dressing.
7. Let the salad sit for about ten minutes. This resting time allows the flavors to meld beautifully.
8. Before serving, garnish the salad with toasted sesame seeds. These seeds not only add flavor but also create an appealing look.
9. Serve the salad immediately for the best texture. Enjoy the crunch and freshness!