Slice the green onion into large 3 cm (1 inch) pieces.
Heat the ttukbaegi (or pot) over medium heat and add cooking oil. Lower the heat. Add the green onion and stir-fry until the oil becomes fragrant with green onion flavor.
Add minced garlic and Korean chili flakes (gochugaru).Stir gently to avoid burning. This step creates a rich red chili oil base.
Pour in 500 ml of water and bring to a boil over high heat.Add anchovy dashida, tuna fish sauce, soup soy sauce, and salt. Let it boil for a few minutes so the flavors come together.
Beat the eggs well in a bowl. Slowly pour them into the boiling soup.
Wait about 10 seconds, then stir gently to keep the broth clear and create soft egg ribbons.
Add two pinches of Korean fine black pepper (soonhuchu) and mix lightly. Enjoy hot as a comforting spicy soup.