Cucumber kimchi (Oi kimchi)

Name: Cucumber kimchi (Oi kimchi)
Prep time: 15 min
Total time: 15 min
Cuisine: Korean
Ingredients: 1.5 pounds cucumbers (Korean cucumbers or other type such as Kirby pickling cucumbers); 1 tablespoon coarse sea salt (less if using fine salt); 2 to 3 ounces garlic chives (buchu, 부추) (Or scallions); 1/4 medium onion; 2 to 3 tablespoons gochugaru 고추가루 (Korean red chili pepper flakes); 1 tablespoon myulchi aekjeot 멸치액젓 (fish sauce); 1 tablespoon saeujeot 새우젓 (salted and fermented shrimp) or use more fish sauce; 1 tablespoon minced garlic; 1/2 teaspoon grated ginger; 2 to 3 teaspoon sugar or 2 tablespoons maesilcheong (Korean plum syrup) (Or your favorite sugar substitute); 1 teaspoon roasted sesame seeds - optional