cucumber - 1 whole (thinly sliced about 0.3 cm)
red onion - 1/4 whole (julienned)
scallion - 1 stalk (finely chopped)
chili pepper (Cheongyang chili) - 1/2 (finely chopped)
ice cubes - watch the video to see (to chill the soup)
sesame seeds - 1/2 tablespoon (for garnish)
sesame oil - watch the video to see (optional, to taste)
soy sauce (guk ganjang) - 1 teaspoon (for seasoning cucumber)
minced garlic - 1 teaspoon (for seasoning cucumber)
salt - to taste (for seasoning cucumber and soup base)
water - 2 cups (cold water for soup base)
vinegar - 3 tablespoons (for soup base)
plum syrup (maesil cheong) - 1 tablespoon (for soup base sweetness)
sugar - 1/2 tablespoon (for soup base)