Slice the cucumbers and sprinkle them with salt. Let them sit for 10–15 minutes to draw out excess water, then drain and gently pat dry.
In a small bowl, whisk together rice vinegar, soy sauce, sesame oil, sugar, and minced garlic.
Toss the cucumbers in the dressing until well coated.
Top with sesame seeds, sliced green onions, and a pinch of red pepper flakes if you like heat.
Serve chilled or at room temperature for a light, refreshing bite.