Begin by rinsing the cucumbers under cold running water to remove any dirt. If using regular cucumbers, peel them for better texture. Slice into thin rounds, about 1/8 inch thick, and place in a large mixing bowl.

In a separate bowl, whisk together the rice vinegar, soy sauce, sesame oil, sugar, and minced garlic until the sugar is fully dissolved to create a flavorful dressing.

Add the sliced red onion to the bowl containing the cucumbers, and pour the dressing over the mixture. Gently toss to ensure every piece is evenly coated.

Cover the bowl with plastic wrap and refrigerate for at least 10 minutes to enhance the flavors.

Just before serving, sprinkle freshly chopped cilantro or mint over the salad, followed by sesame seeds or chopped peanuts for garnish.