Preparing Japanese Cucumber Salad is a breeze when you follow these steps:

1. Slice Cucumbers: Wash the cucumbers and slice them thinly. You can use either a knife or a mandoline for uniform slices.
2. Salt Cucumbers: Place the sliced cucumbers in a bowl and sprinkle with salt. Mix well and let sit for about 10 minutes. This process draws out excess water and enhances the crunch.
3. Make Dressing: In a small bowl, whisk together rice vinegar, soy sauce, sugar, sesame oil, and chili flakes (if using) until the sugar dissolves.
4. Rinse and Dry Cucumbers: After 10 minutes, rinse the salted cucumbers under cold water to remove excess salt. Pat them dry with a paper towel.
5. Combine Ingredients: In a large bowl, combine the cucumbers, dressing, sesame seeds, and chopped green onions. Toss gently to coat.
6. Chill: For the best flavor, let the salad chill in the refrigerator for at least 15 minutes before serving to allow the flavors to meld.
7. Taste and Adjust: Before serving, taste the salad and adjust seasoning as necessary, adding more vinegar or sugar according to your preference.

These simple steps will guide you in creating a refreshing and delightful Japanese Cucumber Salad in no time!