Sometimes you don't want a heavy soup - just something warm, clean, and comforting. This light vegetable dashi soup is one of those simple meals that feels nourishing without being filling. A gentle kombu and dashi broth is simmered with daikon, cabbage, mushrooms, and carrots, creating a naturally sweet and savory soup that's easy to drink and easy to digest.
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It's the kind of soup you can make when you want something cozy but not heavy, or when you need a simple base that can turn into many different meals.
Why This Soup Works
Instead of relying on strong seasoning, this soup builds flavor naturally:
- Kombu and dashi create a clean umami base
- Daikon and cabbage release sweetness
- Mushrooms deepen the savory flavor
- Minimal seasoning keeps it light and balanced
The result is a clear broth that tastes comforting rather than salty - closer to home-style Asian soups than restaurant versions.
How to make Vegetable Dashi Soup (Step by Step)
First, gather your ingredients:
- 4 cups water
- 1 piece kombu (about 2 x 2 inch)
- 1 teaspoon hondashi powder
- Vegetables
- 1 cup cabbage, bite sized
- ½ cup daikon, thin half moons
- ¼ cup carrots, thin sliced
- ½ cup cremini mushrooms, sliced
- Seasoning
- ½ teaspoon soy sauce (adjust to taste)
- pinch white pepper
Make the dashi
Add water and kombu to a pot and slowly heat until steaming.
Remove the kombu before the water reaches a full boil.
Stir in hondashi powder.
Cook the vegetables
Add in this order:
- Daikon and carrots - simmer 4 minutes
- Cabbage and Mushrooms - cook 2-3 minutes
Vegetables should be tender but still fresh.
Season
Taste the broth and adjust gently:
- add soy sauce if slightly flat
- add white pepper for warmth
Keep the broth delicate - it should not taste salty.
Finish
Turn heat to low and you can add some chopped green onions if you prefer.
Serve hot.
Serving Ideas
This soup works as a base for many meals:
- You can serve as is
- Add cooked wontons or dumplings
- Add tofu cubes for protein
- Add noodles (udon is a good one!) for a quick noodle soup
Because the broth is light, it adapts easily without overpowering the main ingredient.
Here is one time I served it with homemade wontons - made it a Wonton Dashi Soup!
Storage & Reheating
Refrigerate:
Let the soup cool completely, then store in an airtight container for up to 3-4 days.
Because this is a light dashi broth, the flavor stays clean even after chilling.
Reheat:
Warm gently on the stovetop over medium-low heat until hot.
Avoid boiling - a hard boil dulls the delicate dashi flavor.
Microwave works too, but heat in short intervals to prevent overcooking the vegetables.
Frequently Asked Questions
Can I leave the kombu in the soup?
It's best to remove it before boiling. Overcooking kombu can make the broth slightly slimy and overly strong. You can slice it and eat it separately if you like.
Is this miso soup?
No - this is a clear dashi soup. Miso can be added, but the recipe is designed to be lighter and cleaner tasting.
Can I make it vegetarian?
Yes - just skip the hondashi and use kombu + dried shiitake mushrooms for a fully plant-based dashi. Dashi is made with dried fish so it is not vegetarian.
Why does my broth taste flat?
Light soups rely on balance, not salt. Usually it just needs a tiny splash of soy sauce or a pinch of white pepper.
Can I add noodles or dumplings?
Definitely. This broth works great as a base for wontons, tofu, or udon noodles without overpowering them.
Can I make it ahead of time?
Yes - it actually tastes better after the vegetables lightly infuse the broth. Just reheat gently.
Light Vegetable Dashi Soup Recipe
A light, clean, and comforting vegetable dashi soup made with kombu and simple vegetables. Naturally sweet and savory without heavy seasoning - perfect as a gentle meal or a base for wontons, tofu, or noodles.
Ingredients
Broth
- 4 cups water
- 1 piece kombu (about 2 x 2 inch)
- 1 teaspoon hondashi powder
Vegetables
- 1 cup cabbage, bite-sized
- ½ cup daikon, thin half-moons
- ¼ cup carrots, thin sliced
- ½ cup cremini mushrooms, sliced
Seasoning (Optional)
- ½ teaspoon soy sauce (adjust to taste)
- pinch white pepper
- green onions, for garnish
Instructions
- Add water and kombu to a pot and slowly heat until steaming. Remove the kombu before the water reaches a full boil and stir in the hondashi powder.
- Add the daikon and carrots and simmer for about 4 minutes.
- Add the cabbage and mushrooms and cook another 2–3 minutes until vegetables are tender but still fresh.
- Season the broth with soy sauce and white pepper to taste, keeping the flavor light and not salty.
- Turn the heat to low, add sesame oil and green onions, and serve hot.
Notes
- Do not boil the soup after seasoning boiling weakens the delicate dashi flavor.
- Great base for wontons, tofu, dumplings, or udon noodles.
- Best enjoyed fresh, but can be reheated gently.
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Nutrition Information:
Yield: 3 Serving Size: ⅓ potAmount Per Serving: Calories: 45Total Fat: 0gSaturated Fat: 0gUnsaturated Fat: 0gSodium: 101mgCarbohydrates: 10gFiber: 3gSugar: 5gProtein: 3g
The nutrition information for this recipe is an approximate total per serving. Please double check the nutrition information for your exact ingredients and brands for more precise nutrition information. Keep in mind that if there is a marinade, often times not all the ingredients will be consumed.
More Delicious Soup Recipes!
If you enjoyed this light vegetable dashi soup, here are a few more comforting soups - from clean and gentle broths to richer, cozy bowls:
Tomato Bean Sprouts Soup - A simple Chinese home-style soup that's fresh, light, and naturally sweet from tomatoes. Easy to make and great when you want something healthy but satisfying.
Thai Coconut Soup - Creamy, aromatic, and comforting with coconut milk and layered flavors. A richer option when you want something cozy but still balanced.
Easy Cornish Hen Soup (Chinese Style) - A clean, nourishing broth simmered with whole Cornish hen, carrots, and ginger. Gentle and comforting, similar in spirit to this dashi soup.
Chinese Corn Carrot Pork Bone Soup - A deeper, heartier broth with sweet corn and tender carrots, perfect when you want a richer slow-simmered soup.
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