Slice the cucumbers about 2 cm thick. Sprinkle evenly with salt to draw out the moisture, and put into a plastic container or ziplock bag.

Drain off the moisture after 30 minutes. Mix with soy sauce, ra-yu and sesame oil. (Adjust the amounts to taste!)

It will be mildly spicy at this point, so if you want it spicier add the dried chili pepper, de-seeded and ripped up. (If you add the seeds it will become spicy!)

Cover the cucumber with plastic wrap and put a weight on top. If you use a plate, you can put other items in the refrigerator on top of it to act as additional weights.