Kongguksu (Chilled Soy Milk Noodles)
Summer noodles in chilled soy milk: soaked beans boiled briefly, skinned, then blended smooth. Not overboiling them and slipping the skins off are what give a fine broth with no astringency — and whether it is seasoned with salt or with sugar splits along regional lines.
Ingredients
- Soy broth (serves 2)
- Dried white soybeans · Dry weight; soaked overnight200 g
- Cold water · For blending; 2–2.5 times the beans500 ml
- Pine nuts · Optional; adds richness and body2 tbsp
- Toasted sesame seeds · Optional1 tbsp
- Salt · Added at the table — see the tips
- Sugar · Instead of salt in some regions. Never both
- Noodles
- Somyeon (thin wheat noodles) · Medium thickness also works2 portions
- Toppings
- Cucumber · Finely julienned0.5
- Tomato · Optional; the older way0.5
- Boiled egg · Optional, halved1
- Black sesame seeds · A pinch
- Alongside
- Yeolmu or napa kimchi · Its acidity carries the mild broth
Steps
- ⏲ 60 min
Rinse the soybeans and soak them in cold water 6–8 hours, or overnight, until one splits under a fingernail. In hot weather, soak them in the fridge.
- ⏲ 12 min
Boil the soaked beans for 8–10 minutes only from the moment the water boils. Not overcooking them is the trick — boiled too long the broth turns dull and keeps a cooked-bean smell. Underdone it tastes raw and beany, so split one and check the inside is evenly cooked.
- ⏲ 15 min
Rinse the beans under cold water and rub the skins off between your hands. Pour off the skins as they float. This one step decides how fine the broth is and whether it tastes astringent.
- ⏲ 5 min
Blend the skinned beans with the 500ml of cold water, pine nuts and sesame for 2–3 minutes, very fine. Stop halfway to scrape the sides down and blend again.
- ⏲ 5 min
Pass it through a fine sieve to catch any grit — skip this if you like it thick. Adjust with water: it should run slowly off a spoon.
- ⏲ 120 min
Chill the broth right down, at least 2 hours. The beany note is much more noticeable when it is lukewarm.
- ⏲ 5 min
Julienne the cucumber finely — how thick you cut it changes how it eats. See Knife skills.
- ⏲ 5 min
Boil the noodles for the time on the packet, then rinse them in cold water, rubbing them to remove the surface starch, and firm them in iced water.
- ⏲ 2 min
Squeeze the noodles firmly dry and put them in the bowls. Water clinging to them thins the broth and blurs the flavour.
- ⏲ 3 min
Pour the cold broth over, add the cucumber, tomato and egg, and scatter black sesame. Salt or sugar goes in at the table, in each person's own bowl — see Salt and seasoning and Balancing flavour.
Tips & Variations
Variations
- Salt or sugar: Seoul and the surrounding region salt it; Jeolla and much of the south sweeten it. Which is correct is an argument Koreans genuinely have — but never use both. Pick one and season in that direction.
- A richer broth: a handful of pine nuts, peanuts or cashews blended in makes it noticeably nuttier and thicker. Shop-bought soy milk is not a good substitute — it already carries sugar and additives that pull the flavour off.
- Kongguk without the noodles: drinking the chilled broth on its own, over ice, is just as common.
- With black soybeans: seoritae gives a greyish-purple broth and a deeper flavour. Skinning them lightens the colour, so some cooks leave the skins on for those.
- Thicker noodles: somyeon is standard, but medium noodles or kalguksu noodles are used too. Thicker noodles hold less broth, so make it richer to compensate.
- The other summer noodles: naengmyeon uses a semi-frozen broth and bibim-guksu a spicy sauce. Kongguksu is the only one of the three seasoned in the eater's own bowl. It is the seasonal opposite of hot janchi-guksu.
Tips
- Do not overboil the beans. Eight to ten minutes. Twenty feels like it should make them softer and does the opposite: the broth goes dull and keeps a cooked-bean smell. One bean split open, evenly coloured through, means done.
- Take the skins off. The most tedious step and the one that pays most. The skins are where the astringency and the gritty texture come from. Rub them in cold water and pour the floating skins away.
- Blend it really fine. Two to three minutes. Blend briefly and no amount of sieving stops it feeling grainy in the throat.
- Chill it completely. The beany aroma becomes more prominent the warmer it is. Two hours minimum, and chilled bowls help.
- Season at the table, not in the jug. Salt stirred in ahead tends to separate out over time, and more to the point salt-versus-sugar is a matter of personal preference.
- Squeeze the noodles dry. Unlike a stock, this broth is only lightly seasoned, so a little water thins it out fast.
- Don't overfill with noodles. The broth is the point. Too many noodles and there isn't enough of it, and you end up with something you toss rather than sip.
- Eat it within a day. Soy broth spoils quickly. One day refrigerated is the limit; after that it turns sour.
- Serve kimchi with it. The broth is deliberately mild, and the acidity of yeolmu or napa kimchi is what carries a whole bowl.
The basics behind this dish
- Dough and Gluten: When to Build It and When to Avoid ItThe same flour and water becomes a dumpling wrapper or a tender pancake. The difference is whether you built gluten or avoided it — and kneading and resting do different jobs.
- Why Sauces Split: Emulsions and Pan SaucesA cream sauce breaking and a carbonara scrambling are the same failure. Temperature and emulsifiers — plus how to bring a split sauce back.
- Knife Skills: Grip, Cuts, and Why Size MattersHow you hold the knife matters more than how fast you cut. The pinch grip, the claw hand, and why uniform size is a cooking decision rather than a cosmetic one.
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