Dashi is Japanese soup stock that is a fundamental ingredient in many Japanese dishes to create authentic flavor. Today, I want to share how to make Kombu Dashi (昆布だし), a vegetarian and vegan soup stock that is the easiest dashi that you can make!
What is Kombu Dashi?
Kombu Dashi (昆布だし) is a Japanese soup stock made with kombu (昆布, dried kelp). Kombu is used extensively in Japanese, Korean, and Chinese cooking. In Korean, it is referred to as dasima (다시마), and in Chinese as haidai (海带).
This sea vegetable earns its name as “the king of seaweeds” because it possesses an amazing flavor and nutritional value, unlike any other seaweed. The most noteworthy advantage is its high content of glutamic acid, an amino acid responsible for umami. And umami is what you’re looking for in a dish where it provides a complex, elemental taste.
If you follow a vegetarian/vegan diet or simply want to embrace a more plant-based diet, kombu is an outstanding ingredient to incorporate into your cooking. Besides being a great flavor enhancer and tenderizer, kombu is a powerful, health-promoting food that can make up for certain nutrients that are absent in the diets.
In my pantry kombu page, I discuss different types of kombu and which kombu is good for specific types of dishes. Please go over the post if you want to know more about how to use kombu for Japanese cooking. You can find it at Japanese and Asian grocery stores.
Ingredients You’ll Need
It takes just two ingredients to make this essential soup stock:
- kombu – dried kelp seaweed
- water
How to Make Kombu Dashi: Two Methods
Method 1: Cold Brew
The cold brew method known as mizudashi (水出し) is pretty hands-off. All you need is to put water and 1–2 kombu strips in a large bottle and let it steep for 2–3 hours or more.
Method 2: Hot Brew
If you need dashi right away, the hot brew or nidashi (煮出し) method is the one to use:
Just place the kombu and water in a medium pot and gently bring out the flavor. Turn off the heat just before it comes to a boil and remove the kelp.
Tips on Cooking with Kombu
- Don’t wash or wipe off the white powdery substance. The white powder compound known as mannitol is the key contributor to umami. The surface of kombu is pretty clean these days, so you may not need to wipe it.
- Make a couple of slits on the kombu to help release more flavor.
- Repurpose the leftover kombu into Kombu Tsukudani (Simmered Kombu) or Homemade Furikake (rice seasoning).
Recipes Using Kombu Dashi
Try these recipes that use kombu dashi stock for a flavorful broth:
- Shabu Shabu (hot pot with vegetables, tofu, meat, mushrooms, and udon noodles)
- Mizutaki (Chicken Hot Pot)
- Mizore Nabe (Hot Pot with Grated Daikon)
- Vegan Miso Soup
- Japanese Vegetable Soup (Kenchinjiru)
- Clear Clam Soup (Ushiojiru)
- Tomato and Tofu Miso Soup
If you can’t access kombu, another delicious option for vegetarian/vegan dashi is Shiitake Dashi.
The Ultimate Dashi Guide
Dashi plays an important role as a flavor enhancer in Japanese cooking, so you don’t need to season the food with too much salt, fat, and sugar. Rich in minerals and other vitamins, dashi is considered a healthy ingredient in our daily diet.
There are six different types of dashi you can use in Japanese cooking, including vegetarian and vegan dashi (*).
- Awase Dashi – a stock made from a combination of kombu + katsuobushi (dried bonito flakes)
- Kombu Dashi * – a stock made from kombu
- Katsuo Dashi – a stock made from dried bonito flakes
- Iriko Dashi – a stock made from dried anchovies/sardines
- Shiitake Dashi * – a stock made from dried shiitake mushrooms
- Vegan Dashi * – a stock made from dried shiitake mushrooms and kombu
If you are new to different types of dashi, check out my Ultimate Dashi Guide.
Wish to learn more about Japanese cooking? Sign up for our free newsletter to receive cooking tips & recipe updates! And stay in touch with me on Facebook, Pinterest, YouTube, and Instagram.
Kombu Dashi Recipe (Vegan)
Ingredients
- 1 piece kombu (dried kelp) (10 g; 4 x 4 inches, 10 x 10 cm per piece)
- 4 cups water
Instructions
- Gather all the ingredients. Wipe any dirt from 1 piece kombu (dried kelp) with a damp cloth (but don't wipe off the white powder). Cut a couple of slits in the kombu to release more flavor. Nami's Tip: Do not wipe off the white powdery compound called mannitol, as it's the key contributor to umami. Kombu is pretty clean these days, so you may not need to wipe it.
Method 1: Cold Brew Kombu Dashi (Mizudashi)
- Put 4 cups water and the kombu in a large bottle. Cover and steep at room temperature for 2–3 hours in the summer (4–5 hours in the winter) or overnight in the refrigerator. Remove the kombu. The dashi is ready to use.Nami's Tip: If you leave the kombu in the pot, the dashi will become slimy and bitter. Skip ahead to see how to use the spent kombu in other recipes.
Method 2: Stovetop Kombu Dashi (Nidashi)
- Put the kombu and water in a medium pot. Set over medium-low heat and bring it up to a bare simmer over 10 minutes.Nami's Tip: If you have time, soak the kombu for 3 hours or up to a half day to release more flavor naturally.
- Skim off the scum and foam from the stock's surface with a fine-mesh skimmer. Just before the dashi starts boiling, remove the kombu. The dashi is ready to use.Nami's Tip: If you leave the kombu in the pot, the dashi will become slimy and bitter. See below for how to use the spent kombu in other recipes.
To Store
- If you are not using the dashi right away, keep it in a bottle or airtight container and store in the refrigerator for up to 4–5 days or in the freezer for up to 2 weeks. I recommend using it sooner for the best flavor.
To Use the Spent Kombu
- Save the spent kombu in an airtight container and store it in the refrigerator for up to a week or in the freezer for up to a month. Use it to make Simmered Kombu (Kombu Tsukudani) and Homemade Furikake (Rice Seasoning).
Nutrition
Did you make this recipe?
Tag @justonecookbook on Instagram so we can see your delicious creation!
Editor’s Note: This post was originally published in February 2013. The images have been updated in April 2019.
