Korean Japchae with Sweet Potato Noodles
Glass noodles clump if they are overboiled or left without oil. Boil them for exactly 6 minutes, rinse under cold water immediately to stop the cooking, and toss in sesame oil straight away — that keeps them separate and springy.
- Prep
- 30 min
- Cook
- 25 min
- Total
- 55 min
- Calories
- 420
Japchae is Korea's celebration noodle dish, built on chewy sweet potato starch noodles and vegetables cooked one at a time so each keeps its own colour and flavour.
Method
-
1
The sauce
Mix all the sauce ingredients until the sugar dissolves.
⏱ 3 min -
2
The beef
Marinate the sliced beef in two tablespoons of the sauce for 15 minutes, then sear it in a hot pan for 3 minutes.
⏱ 18 min -
3
Vegetables — one at a time
Stir-fry each vegetable separately in a little oil with a pinch of salt: onion 2 minutes, carrot 2 minutes, peppers 1 minute, mushrooms 3 minutes. Blanch the spinach for a minute and squeeze it dry.
⏱ 14 min -
4
The noodles
Boil the noodles in plenty of water for exactly 6 minutes, then drain and rinse under cold water immediately.
⏱ 8 min -
5
Oil straight away
Toss the noodles in two tablespoons of sesame oil while they are still wet — this is what stops them sticking together.
⏱ 2 min -
6
Combine
In a large bowl, mix the noodles with the remaining sauce, then add all the vegetables and the beef and toss gently with your hands for even distribution.
⏱ 5 min -
7
Serve
Scatter the sesame seeds. Japchae is served hot or at room temperature — both are correct.
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Tips that actually matter
- Exactly 6 minutes then an immediate cold rinse — any longer and the noodles turn pasty.
- Sesame oil goes on right after the rinse, while the noodles are still wet.
- Cook each vegetable separately; cooking them together gives one muddled flavour and dull colour.
- Toss by hand rather than with a spoon — a spoon breaks the noodles.
People also ask
Why did my noodles clump?
Overboiling, no cold rinse, or oil added too late. All three matter: 6 minutes, an immediate rinse, and oil straight away.
Can I make it vegetarian?
Yes — leave out the beef and add more mushrooms. Japchae is frequently made without meat in Korean temple cooking.
Can I make it ahead?
Yes — it is served at room temperature and keeps two days in the fridge. Reheat in a pan with a splash of water, or eat it cold.
Cook mode
Korean Japchae with Sweet Potato Noodles
-
1
The sauce
Mix all the sauce ingredients until the sugar dissolves.
-
2
The beef
Marinate the sliced beef in two tablespoons of the sauce for 15 minutes, then sear it in a hot pan for 3 minutes.
-
3
Vegetables — one at a time
Stir-fry each vegetable separately in a little oil with a pinch of salt: onion 2 minutes, carrot 2 minutes, peppers 1 minute, mushrooms 3 minutes. Blanch the spinach for a minute and squeeze it dry.
-
4
The noodles
Boil the noodles in plenty of water for exactly 6 minutes, then drain and rinse under cold water immediately.
-
5
Oil straight away
Toss the noodles in two tablespoons of sesame oil while they are still wet — this is what stops them sticking together.
-
6
Combine
In a large bowl, mix the noodles with the remaining sauce, then add all the vegetables and the beef and toss gently with your hands for even distribution.
-
7
Serve
Scatter the sesame seeds. Japchae is served hot or at room temperature — both are correct.
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