
Rinse the cucumber thoroughly under cold running water and cut off the ends. If using a Japanese cucumber, slice it in half lengthwise. If using a regular cucumber, quarter it lengthwise.
Use a teaspoon to scoop out the seeds, then pat the cucumber pieces dry with paper towels.
Slice the cucumber diagonally into bite-sized pieces.
Transfer the cucumber into a bowl, sprinkle with salt, and mix well. Let it sit for 30 minutes.
Drain any excess water, then add sugar and Chinese rice vinegar. Stir to combine.
Chill in the refrigerator for at least 1 hour before serving. Serve as a refreshing appetizer or side dish.