Wash your cucumbers thoroughly and slice them about ⅛ to ¼ inch thick. You can slice them into rounds or thin half-moons depending on your preference.
Place the cucumber slices in a bowl and sprinkle them with a full teaspoon of salt. Toss well and let them sit for about 10 minutes. This step draws out excess moisture and helps maintain that satisfying crunch.
After 10 minutes, drain the cucumbers and gently squeeze out any remaining water. Pat dry with a paper towel if needed.
In a small bowl, combine gochugaru, rice vinegar, sugar, sesame oil, minced garlic, soy sauce (if using), and half of the sesame seeds. Stir until well mixed.
Add the drained cucumbers and chopped scallions to the seasoning mix. Toss gently to coat every slice in that beautiful red marinade.
Taste and adjust: add more vinegar for tang, more sugar for sweetness, or a touch more gochugaru if you like it spicier.
Sprinkle the remaining sesame seeds on top, and Korean cucumber salad is ready!
Serve salad immediately for the freshest crunch, or refrigerate for 30 minutes to let the flavours meld.