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Japanese cold noodle soba served in a wooden bowl with mentsuyu sauce in the middle.

Low Carb Japanese Soba

A low carb Japanese soba recipe brimming with soy umami flavors found in the traditional Japanese recipe! A perfect cold noodle main dish.
Course Main Course
Cuisine Japanese
Keyword Japanese cold noodle recipe, Japanese soba recipe, low carb Japanese noodles, soba noodle substitute
Prep Time 5 minutes
Cook Time 5 minutes
Total Time 10 minutes
Servings 2
Calories 627kcal


  • 4 oz Edamame Noodles
  • 1/3 Cup Japanese Sake
  • 1/4 Cup Soy Sauce
  • 2 tbsp Sweetener sugar alternative, sugar or preferred sweetener
  • 1 1/2 Cup Bonito Flakes can sub with 1/4 tsp of hondashi
  • 2 1/2 tbsp Cold Water add more water for lighter sauce
  • 1 Stalk Green Onion
  • 1/2 Inch Ginger


  • Gather all the ingredients.
    Low Carb Japanese Soba Recipe (44)
  • Boil about 3-4 cups of water in a stove top pot.
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  • While waiting for the water to boil, in another stove top pot, add Japanese Cooking Sake, Soy Sauce, sweetener and bring to light boil. Once lightly boiling, reduce heat to simmer, mix in Bonito Flakes and simmer for 1 minute. Once 1 minute has passed, remove from heat and set aside. This will be your 'mentsuyu' or concentrated dipping sauce.
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  • Finely slice green onions and transfer to serving plate.
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  • Grind down ginger with grater and transfer to serving plate.
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  • Once water is boiling from step 2), add Edamame Noodles and follow cooking instructions indicated on package (ours required to steep in boiled water for 4 minutes). Once cooked, use a strainer and wash in cold water. Transfer to serving plate.
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  • Using a strainer, strain mentsuyu sauce into a bowl and use a spoon to push out any excess sauce from the Bonito Flakes. Next, mix 2 1/2 tbsp of cool water into the concentrated dipping sauce and split sauce equally among servings. Note - if you would like a lighter sauce, add more water and visa versa.
    Low Carb Japanese Soba Recipe (43)
  • To enjoy, add selected toppings into the mentsuyu dipping sauce and mix well. Then take a little bit of the noodles, dip into the dipping sauce and enjoy!
    Low Carb Japanese Soba Recipe (46)



Calories: 627kcal | Carbohydrates: 9g | Protein: 122g | Fat: 1g | Saturated Fat: 1g | Cholesterol: 119mg | Sodium: 2095mg | Potassium: 1603mg | Fiber: 1g | Sugar: 1g | Vitamin A: 60IU | Vitamin C: 1mg | Calcium: 6mg | Iron: 1mg