Cut cucumbers into your preferred size and put them and shio kombu in a plastic bag.
Seal the bag and gently massage with both hands until the cucumbers turn a brownish color.
Place it in an airtight container, and refrigerate for at least 30 minutes.
Notes
Storage: It will last for 3 days in the fridge.
Substitute: You can substitute shio kombu with 1 tsp of dashi powder and 1 tsp of sugar.
Enjoy variations by adding: Sesame oil and soy sauce to add more flavor, or carrot and cucumber to make it more crispy, or red pepper to make it spicy.
If you are not in a hurry, let it sit overnight to absorb the flavor.