Japchei Recipe

Soak/Boil Noodles

Bring a large pot of water to a rolling boil. Add the sweet potato glass noodles and cook according to package instructions (typically 6–8 minutes) until they are tender but chewy. Stir occasionally so they don't stick. Drain the noodles and run under cold water to stop cooking; drain well and cut noodles several times with kitchen scissors (about 6–8 cuts) to shorten them for easier eating.

Mix Sauce

While noodles cook, whisk together light soy sauce, dark soy sauce, sesame oil, sugar, and ground black pepper in a small bowl. Taste and adjust: add up to 1 tsp more sugar or 1/2 tbs more soy sauce if desired. Set aside.

Toss drained noodles with about half of the sauce mixture so they absorb flavor while you stir-fry the other components. Reserve the remaining sauce to finish the dish.

Season Beef

Place the thinly sliced beef in a bowl; add the mirin and 1/2 tablespoon of the light soy sauce from the sauce mixture (or 1/2 tbs soy), and toss to coat. Let sit 5–10 minutes while preparing vegetables.

Quick Stir-Fry

Heat a large nonstick skillet or wok over high heat. Add 1 tablespoon vegetable oil and swirl to coat. Add the marinated beef in a single layer and sear quickly, stirring for 1–2 minutes until browned but still slightly pink inside (be careful not to overcook). Remove beef to a plate and keep warm.

Cook Carrots & Onions

In the same skillet over medium-high heat, add another 1/2 tablespoon oil if needed. Add the julienned carrots and sliced onion, stir-fry 2–3 minutes until they begin to soften and slightly caramelize.

Add Mushrooms & Garlic

Add sliced shiitake mushrooms and minced garlic to the skillet. Stir-fry 2–3 more minutes until mushrooms are tender and fragrant.

Blanch Spinach

While stir-frying, bring a small pot of water to a boil. Add the spinach and blanch for 20–30 seconds until wilted. Drain well and squeeze out excess water using your hands or a clean towel. Roughly chop or leave whole per preference. Season lightly with a pinch of salt and a few drops of sesame oil; set aside.

Add Scallions

Return cooked beef to the skillet with the vegetables, add the prepared spinach and the green onion pieces, and toss briefly to combine and warm through (30–60 seconds).

Add the drained noodles to the skillet with the beef and vegetables. Pour the reserved sauce over everything and use tongs or two spatulas to toss and combine thoroughly so the noodles are evenly coated. Stir-fry together 1–2 minutes until heated through and flavors meld.

Taste and adjust seasoning: add a splash more soy sauce for saltiness, a pinch of sugar for balance, or a few extra drops of sesame oil for aroma.

Transfer japchae to a serving platter or divide among bowls. Sprinkle toasted sesame seeds over the top and drizzle the optional 1 tsp sesame oil if desired. Serve warm or at room temperature.