The first time I had kongguksu, I was fairly sure someone had handed me a savory smoothie by mistake. Pale, thick, ice-cold, and topped with half a boiled egg, it looked nothing like a bowl of noodles is supposed to look. I was in Seoul on a brutal July afternoon when a friend dragged me into a tiny lunch counter that only served one thing. One spoonful in, I got it.
No broth simmering, no stock reducing for hours, nothing hot involved at all. Just a blender, a fridge, and the will to survive summer without touching the stove. I’ve been making my own version ever since, built around silken tofu instead of soaked soybeans, because I refuse to plan a lunch three days in advance.
This is the lazy, weeknight-friendly take: still creamy, still nutty, still shockingly refreshing, minus the soybean-soaking marathon.
Easy Kongguksu – About the dish
Kongguksu (콩국수) means, quite literally, “bean noodle soup”: kong for soybean, guksu for noodles. It’s a summer staple from South Korea’s Chungcheong region, traditionally served ice-cold during the hottest, most humid weeks of the year, when a bowl of hot soup sounds like a punishment rather than a meal.
The classic version starts with dried soybeans, soaked overnight, boiled, then blended into a thick, milky broth. It’s possibly one of the more labor-intensive “cold” dishes out there, which is a little ironic for something invented to beat the heat. This version cheats, using silken tofu and unsweetened soy milk to get that same creamy, nutty broth in about the time it takes to boil noodles.
Easy Kongguksu – Recipe
Ingredients – Advice & key points
- Somen noodles: thin wheat noodles are traditional, but soba, spaghetti, or any thin noodle you have on hand works just as well, just cook them separately from the broth.
- Firm silken tofu: the shortcut of this whole recipe. Instead of soaking and boiling dried soybeans, blending silken tofu straight into the broth gets you the same creamy texture in minutes.
- Unsweetened soy milk: make sure it’s plain, not a vanilla or sweetened version.
- Peanut butter: adds richness and a nutty depth that stands in for the roasted soybean flavor of the traditional broth. Use a smooth, natural style rather than a very sweet one.
- Sesame seeds: blended right into the broth for extra nuttiness. Give the blender an extra minute if you use them, since they take longer to break down completely.
- Fine salt: the broth is meant to taste a little assertive on its own, the toppings aren’t seasoned, so everything balances out once assembled.
- Sugar (optional): just a small amount to round out the flavors, feel free to skip it entirely.
- Hard-boiled eggs: a classic topping, halved and placed on top just before serving.
- Cucumber: cut it into very thin julienne so it stays crisp against the cold broth.
- Cherry tomatoes (optional): a modern, colorful addition, not traditional, but a nice bit of acidity.
- Ice cubes: essential at serving, not just for temperature, they keep the broth from ever going lukewarm at the table.
- Sesame oil: a finishing drizzle, not blended in. It adds a deep, nutty aroma that ties the whole bowl together.
Recipe – Advice & key points
- Blend until completely smooth: give it at least a full minute, closer to two if you’re using sesame seeds, so there’s no graininess left in the broth.
- Serve immediately or chill further: you can ladle the broth over noodles right away with ice, or chill it in the fridge for about two hours first, it gets even creamier and colder that way.
- Don’t panic about the salt level: tasted on its own, the broth will seem a bit too salty. That’s normal, the unseasoned noodles and toppings pull it back into balance.
- Keep components separate until the last minute: cook the noodles, rinse them, and store the broth and toppings apart so nothing turns soggy while you wait.
- Build the bowl in order: noodles first, broth poured over, then toppings, a final drizzle of sesame oil, and ice cubes right before serving.
Serve it the moment it hits the table, kongguksu doesn’t really do “later.”
Easy Kongguksu
Description
A creamy, ice-cold Korean noodle soup made with a silken tofu and soy milk broth, topped with hard-boiled egg, cucumber and sesame oil, no stove-hovering required.
Ingredients
Noodles
Creamy Soy Broth
Toppings
Instructions
Method
Blend the broth
In a blender, combine the silken tofu, soy milk, peanut butter, sesame seeds, salt and sugar. Blend around 2mn, until completely smooth.
Keep in the fridge while you prep your noodles and toppings.
Cook the noodles
Cook the somen noodles according to package instructions. Drain and rinse thoroughly under cold running water until completely cooled, then set aside.
Serve immediately or chill
Ladle the broth over the noodles right away with ice, or chill the broth in the fridge for about 2 hours first, it will get even creamier and colder that way.
Assemble and serve
Divide the noodles between bowls, then pour the broth over.
Top with the hard-boiled eggs, cucumber and cherry tomatoes, add a few ice cubes and a drizzle of sesame oil. Serve immediately.