Finely chop the green onion for the seasoning sauce and thinly slice the Cheongyang chili peppers in half to allow their spicy flavor to infuse well.
Place the prepared green onion and Cheongyang chili peppers in a bowl, and pour in soy sauce just enough to cover them, not completely submerge.
Mix gochugaru, minced garlic, a pinch of sugar, and finely ground sesame seeds into the soy sauce to create a thick seasoning sauce, then finish by drizzling generously with sesame oil.
Julienne the vegetables for the broth (onion, zucchini, carrot, shiitake mushroom) into uniform, not-too-thin pieces to prevent them from breaking apart during cooking.
Fill a pot with water, bring it to a boil, then add all the prepared vegetables to create a refreshing vegetable broth.
In another pot, bring plenty of water to a boil for the somen noodles. Add the noodles, and each time the foam rises and boils, add half a cup of cold water, a total of two times, to cook them to a chewy texture.
Immediately rinse the cooked somen noodles in cold water, rubbing them vigorously like washing laundry, then drain them completely in a sieve.
Season the boiling vegetable broth with soup soy sauce for a subtle aroma and color, and adjust the remaining taste with salt. (If you want a richer, store-bought flavor, add a small amount of Dashida.)
Gently pour the lightly beaten egg into the broth in a circular motion and let it simmer briefly before turning off the heat.
In a bowl, arrange the drained somen noodles, pour the hot vegetable broth and abundant vegetable toppings, and finish by adding the prepared all-purpose seasoned soy sauce.
Mix finely chopped green onion and chili peppers with soy sauce, gochugaru, garlic, sesame seeds, and sesame oil to make a thick, all-purpose seasoned soy sauce.
Add julienned onion, zucchini, carrot, and mushrooms to boiling water to make vegetable broth, and season the broth with soup soy sauce, salt, and beaten egg.
Pour hot broth over somen noodles that have been boiled and rinsed thoroughly in cold water, and serve with the seasoned soy sauce.
Cooking tips 💡
When making the seasoned soy sauce, if you add too much soy sauce, the vegetable juices will come out and it will become watery. It tastes best when you add just enough soy sauce to mix the ingredients thickly.
To keep the broth clear and clean, use soup soy sauce only sparingly for flavor and aroma, and the secret is to use salt for the remaining seasoning to keep it light.
When rinsing the somen noodles in cold water, rub them vigorously like laundry to completely remove the starch. This will keep the noodles chewy and free of a floury taste for a long time.
If using dried shiitake mushrooms, boil them with the vegetables from the start in cold water. This will allow the unique deep umami and aroma of the shiitake to fully infuse into the broth.
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