Prepare cucumber: Slice the cucumbers into slightly thick rounds. You can peel the cucumbers if you prefer.
Make the dressing: Put minced garlic, rice vinegar, sesame oil, soy sauce, cane sugar, salt, and red chili flakes in a small bowl. Whisk until sugar dissolves.
Toss cucumber with dressing: Pour the dressing over the cucumber slices and toss to coat. Finish it off by adding chopped cilantro, crushed peanuts, and sesame seeds. Enjoy!