Wash the cucumber thoroughly and slice it diagonally.
Place the cucumber slices and a pinch of salt in a bowl and let sit for 5 minutes.
Squeeze out the excess moisture from the cucumber.
Combine peanut butter, soy sauce, minced garlic, vinegar, and sesame oil to make the dressing.
Add the dressing to the cucumber and mix well.
Transfer to a plate and sprinkle with sesame seeds to finish.