
Japanese-Style Bibim Guksu (Spicy Cold Somen Noodles)
Bibim Guksu is a popular Korean cold noodle dish known for its refreshing heat. While traditional Korean versions use extremely chewy noodles made from potato or sweet potato starch, those can be difficult to find. In this recipe, we use Japanese Somen (thin wheat noodles). Somen’s delicate texture allows it to “catch” the spicy sauce perfectly, making it an excellent, pantry-friendly substitute.
The Origins: Pyongyang vs. Hamhung
In Korea, there are two famous styles of Naengmyeon (cold noodles) named after their regions of origin:
- Pyongyang Naengmyeon: This version features thin noodles made from a blend of buckwheat flour and potato starch, served in a clear, refreshing cold broth. The buckwheat gives the noodles a distinct earthy flavor and a slightly firmer bite.
- Hamhung Naengmyeon: This style is served without soup. Instead, it is mixed with or topped by a vibrant Yangnyeomjang (sweet and spicy sauce).
This recipe is a Japanese take on the Hamhung style—”Bibim” means to mix, and “Guksu” means noodles.
What is Gochujang?
Gochujang is a fermented, savory, and pungent sweet-spicy miso paste. It is made by saccharifying rice or glutinous rice with koji, adding chili peppers, and allowing it to mature.
Dietitian’s Note: The fermentation of the rice creates a natural sweetness that perfectly balances the heat of the chili. This makes Gochujang a powerful “one-stop” seasoning for adding depth to any dish. I personally recommend O-Food’s Gochujang for its ideal balance of flavors.

Nutrition Facts (Per Serving)
| Calories | Protein | Fat | Carbohydrates | Salt Equivalent |
| 464 kcal | 21.0g | 9.3g | 72.3g | 2.9g |
Ingredients
- Chicken breast: 30g
- Sake: 20g (for steaming)
- Egg: 1/2 (Large)
- Cucumber: 20g
- Somen noodles: 75g
- White sesame seeds: 3g
☆ The Sauce (Yangnyeom):
- Gochujang: 20g
- Soy sauce: 8g
- Vinegar: 8g
- Sugar: 4g (Note: You can substitute this with apple or pear juice for a traditional fruit-based sweetness)
- Grated garlic: 3g
- Sesame oil: 3g
Cooking Instructions
- Prepare the Chicken: Place the chicken breast on a heat-resistant plate and sprinkle with sake. Wrap loosely and microwave for 2 minutes. While the chicken is still slightly warm, loosen it into bite-sized pieces. Using slightly warm chicken against the cold noodles creates a pleasant temperature contrast.
- Boil the Egg: Boil in hot water for 7 minutes for a perfect consistency.
- Prep the Vegetables: Cut the cucumber into thin strips. For extra texture and digestive enzymes, you can also add shredded daikon or kimchi for probiotic benefits.
- Mix the Sauce: Combine all ingredients marked with ☆ in a small bowl.
- Boil & Rinse Somen: Boil the noodles for 90 seconds. Immediately rinse them vigorously under cold running water.
- Pro-Tip: This “vigorous rinse” not only prevents sticking but also removes excess surface starch, resulting in a cleaner, sharper flavor profile.
- Combine: Thoroughly drain the noodles and mix them with the sauce.

関連リンク🔗

If you love the flavor of Gochujang, you won’t want to miss my popular “Yangnyeom Chicken” recipe! The sweet and spicy sauce perfectly coats the crispy fried chicken, making it an addictive dish the whole family will love. Check it out here!
👉 [A popular Korean dish in Japan! Yangnyeom chicken recipe]
📖Read the Japanese version of this article here! [夏の簡単ランチに!そうめんで作る「ピリ辛日本風ビビン麺」のレシピ]


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