Trim one end of each cucumber and thinly slice them diagonally to create oval shapes.
Place the cucumber slices in a bowl and sprinkle with 1/2 teaspoon of salt.
Mix together gently, then chill in the refrigerator for at least 20 minutes to draw out excess moisture.
After chilling, drain the cucumbers and rinse them quickly under cold water for about 10 seconds.
Return the drained cucumbers to the bowl and add sesame oil, soy sauce, sugar, rice vinegar, chili oil, sesame seeds, and minced garlic if using.
Toss everything thoroughly to blend the flavors well and serve immediately for the freshest taste.