Rub cucumbers with sea/coarse salt and wash nicely. Wipe them dry with a clean kitchen towel. Next, cut them into one inch sticks.
Sprinkle salt over the cucumbers and gently mix. Cover and let them sit for 15 – 20 minutes to release all the water.
Later, squeeze out all the water from salted cucumbers. Transfer them to a wide bowl. Add julienned carrot, and green onion.
To make kimchi paste, in a blender combine diced apple, onion, ginger, and half of minced garlic. Using ⅛ to ¼ cup of water blend to a smooth, thick paste.
Transfer kimchi paste to a bowl. Add Korean chilli flakes, sugar, and soy. Mix nicely. Taste and adjust seasoning if required.
Add kimchi paste to the vegetables. Wearing gloves (to avoid spicy hands), mix well until all the vegetables are coated. At this stage you can taste the kimchi and add more seasoning if required.
Tightly pack the cucumber kimchi into a clean glass jar. Store in the refrigerator or enjoy with your meal.