Equipment
Ingredients
Noodles
- 200 g sweet potato glass noodles, dry
Vegetables
- 150 g spinach, washed and stems trimmed
- 100 g carrot, peeled and cut into thin matchsticks
- 100 g yellow onion, thinly sliced
- 100 g red bell pepper, cored and cut into thin strips
- 100 g shiitake mushrooms, stems removed, caps thinly sliced
- 30 ml neutral cooking oil
Sweet Soy Sesame Sauce
- 60 ml soy sauce
- 30 ml toasted sesame oil
- 30 g brown sugar, packed
- 15 g garlic, minced
- 10 g toasted sesame seeds
- 2 g black pepper, freshly ground
Nutrition (per serving)
Nutrition is estimated per serving. Nutrients without complete source data are omitted.
Full nutrition
- Calories
- 410 kcal
- Protein
- 4 g
- Carbohydrates
- 63 g
- Fat
- 17 g
- Fiber
- 4 g
- Sugar
- 11 g
- Sodium
- 883 mg
- Saturated Fat
- 2 g
- Monounsaturated Fat
- 3 g
- Polyunsaturated Fat
- 4 g
- Potassium
- 568 mg
- Calcium
- 111 mg
- Iron
- 3.2 mg
- Magnesium
- 67 mg
- Phosphorus
- 132 mg
- Zinc
- 1.2 mg
- Vitamin A
- 424 mcg
- Vitamin C
- 47 mg
- Vitamin D
- 0.1 mcg
- Vitamin E
- 1.5 mg
- Vitamin K
- 188 mcg
- Vitamin B6
- 0.4 mg
- Thiamin
- 0.18 mg
- Riboflavin
- 0.21 mg
- Niacin
- 2.3 mg
- Folate
- 103 mcg
- Water
- 144 g
Sources: Aggregated Public Data, USDA FoodData Central
Method
In a small bowl, combine the soy sauce, toasted sesame oil, brown sugar, minced garlic, and black pepper. Whisk vigorously until the sugar is fully dissolved. Set aside.
Bring a large pot of water to a rolling boil at 100°C/212°F. Submerge the spinach and blanch for 30 seconds until just wilted. Remove the spinach with tongs, immediately rinse under cold water to stop the cooking, and squeeze out all excess moisture. Cut the spinach into bite-sized pieces.
Return the same pot of water to a boil. Add the sweet potato glass noodles and cook for 6 to 7 minutes. Drain well in a colander, rinse briefly with warm water to remove surface starch, and use kitchen shears to cut the long noodles in half a few times.
Heat a large skillet over medium-high heat. Add a few drops of neutral oil. Sauté the sliced onions until fragrant and slightly translucent. Transfer the onions to a large mixing bowl.
In the same skillet, add a little more oil and individually sauté the carrots, then the bell peppers, and finally the shiitake mushrooms. Cook each vegetable separately for 1 to 2 minutes until just tender, transferring each to the large mixing bowl once done.
Add the warm noodles and prepared spinach to the large mixing bowl with the sautéed vegetables. Pour the prepared sauce over the ingredients.
Sprinkle the toasted sesame seeds into the bowl. Toss everything together thoroughly by hand or with tongs until the noodles have absorbed the sauce and taken on a rich brown color. Serve warm or at room temperature.
Chef's Notes
- Stir-frying the vegetables individually is the traditional hallmark of authentic japchae; it prevents the ingredients from steaming together and preserves their bright colors and distinct crunch.
- Sweet potato noodles act like sponges when warm. Tossing them with the dressing immediately after cooking ensures they absorb flavor internally rather than just being coated on the outside.
- For the absolute best mushroom texture, use dried shiitake mushrooms rehydrated in warm water rather than fresh. They offer a much meatier chew and a deeper umami profile.
- Japchae is highly adaptable. Feel free to add wood ear mushrooms, garlic chives, or a thinly sliced vegetarian egg omelet ribbon (jidan) if your dietary preferences allow.
Storage
Refrigerator: 3 days — Store in an airtight container. Noodles will harden significantly when chilled.
Reheating: Microwave with a splash of water, or gently stir-fry in a pan until warm and the noodles regain their soft, chewy texture.
Troubleshooting
Noodles are tough or rubbery
Cause: Noodles were undercooked or they cooled down too much before the sauce was added
Fix: Add a splash of water and gently stir-fry the assembled mixture in a pan over medium heat until the noodles soften
Prevention: Test a noodle before draining to ensure no hard core remains, and mix with the sauce while warm
Dish tastes watery or lacks flavor
Cause: Excess water was not squeezed from the spinach or noodles were not drained well
Fix: Toss the mixture in a hot skillet for a few minutes to evaporate excess moisture, then adjust seasoning with a dash of soy sauce and sesame oil
Prevention: Thoroughly squeeze blanched spinach and drain noodles completely before mixing
Cultural Context
Japchae translates literally to mixed vegetables. It was originally invented in the early 17th century for King Gwanghaegun and contained no noodles at all. The addition of the signature sweet potato glass noodles (dangmyeon) occurred in the 20th century, transforming it into the beloved staple dish that graces nearly every Korean celebration and holiday table today.
