Niboshi Dashi: How to Make and Use Dried Sardine Stock

When it comes to Japanese dashi, kombu and katsuobushi are the most well-known options. However, there is another essential variety you should not overlook: niboshi dashi. Made from niboshi (dried sardines, also called iriko), this stock features a bold umami driven by inosinic acid. When used in miso soup or udon broth, it delivers a deep, rustic flavor. While niboshi dashi is a staple of home cooking in Japan, you can easily make it in Ho Chi Minh City as long as you have the right ingredients. This article covers everything from the basics to advanced tips, organized into seven key points.

What Is Niboshi? Characteristics as a Dashi Ingredient

Niboshi is a dried food product made by boiling small fish such as Japanese anchovies (katakuchi iwashi) in salted water and then sun-drying them. In Japan, niboshi is also called "iriko," with the name varying by region: "niboshi" is common in the Kanto area, while "iriko" is more widely used in Kansai and Shikoku.

The defining characteristic of niboshi as a dashi ingredient is its robust umami, rich in inosinic acid. While it shares the same inosinic acid-based umami as katsuobushi, niboshi produces a more concentrated flavor with a pronounced fishy note. This makes it strong enough to hold its own when paired with bold seasonings like miso.

Niboshi dashi has been a daily staple in households across eastern Japan. It is the most popular dashi for miso soup and is considered the foundation of "mom's home cooking."

How to Choose Good Niboshi

The quality of your niboshi is crucial for making delicious dashi. Use the following guidelines when selecting them.

Visual Check

• Color: Fresh niboshi have a silvery sheen with a uniform color throughout. Yellowish discoloration indicates oxidation, which leads to a fishy-smelling dashi.
• Shape: Ideally, the body should be curved in a hook shape. This indicates the fish were processed while still fresh.
• Belly: Choose niboshi with intact bellies. Split bellies expose the innards and cause bitterness.

Smell Check

• Fresh niboshi have a pleasant, dry fish aroma. Avoid any with a sour or oily smell.

Size Guide

• For general dashi making, medium-sized niboshi about 6 to 8 cm long are the easiest to work with. Fish that are too large tend to produce bitterness, while ones that are too small make it difficult to extract enough dashi.

Preparation: How to Remove the Head and Guts (Tips for Eliminating Bitterness)

The most important step in making niboshi dashi is removing the head and innards (wata). Whether or not you do this carefully will significantly affect the taste of your dashi.

Why Remove the Head and Guts?

The head and the dark innards (wata) inside the belly of niboshi contain compounds that cause bitterness and an unpleasant aftertaste. Removing them allows you to extract only the clean, pure umami.

Steps

1. Pinch the head of the niboshi with your fingers and snap it off.
2. Split the body in half lengthwise. It is easier to split from the back side using your fingernail.
3. Use your fingers to remove the dark, string-like guts from inside the belly.
4. The prepared niboshi is now ready for making dashi.

Tips

• If full preparation feels too tedious, simply removing the head and splitting the body in half still makes a noticeable difference.
• When you have spare time, prepare a large batch and store them in a zip-lock bag in the freezer for convenience.
• For miso soup, the miso will absorb some of the bitterness, so just removing the head is sufficient when you are in a hurry.

Two Methods for Making Dashi: Cold Soaking and Simmering

There are two methods for making niboshi dashi: cold soaking (mizudashi) and simmering (nidashi). Understanding the characteristics of each method will help you choose the right one for your dish.

Cold Soaking: Clean and Elegant Flavor

Cold soaking involves placing niboshi in water and leaving them in the refrigerator overnight. Since no heat is applied, off-flavors are minimized, resulting in a clean, elegant dashi.

Ingredients (for approximately 1 liter)

• Niboshi: 30 g (prepared)
• Water: 1 liter

Steps

1. Place the prepared niboshi in a container.
2. Pour in water, cover with plastic wrap or a lid, and refrigerate.
3. Soak for 6 to 8 hours (overnight is ideal).
4. Remove the niboshi and the dashi is ready.

Best suited for: clear soups, delicate simmered dishes, somen dipping sauce

Simmering: Bold and Rich Flavor

Simmering involves soaking niboshi in water and then heating them on the stove. This method produces a richer, more intense dashi compared to cold soaking. It is well suited for dishes with robust seasoning, such as miso soup and udon.

Ingredients (for approximately 1 liter)

• Niboshi: 30 g (prepared)
• Water: 1 liter

Steps

1. Place water and prepared niboshi in a pot and soak for at least 30 minutes (this step can be skipped if you are short on time).
2. Heat over medium flame. Once boiling, reduce to low heat.
3. Use a ladle to carefully skim off the scum (grayish-white foam) that rises to the surface.
4. Simmer on low heat for 5 to 7 minutes. The key is not to let it boil vigorously.
5. Turn off the heat and strain through a sieve or paper towel to finish.

Best suited for: miso soup, udon broth, simmered dishes in general, ramen soup base

Best Dishes for Niboshi Dashi: Miso Soup, Udon, and Ramen

The bold umami of niboshi dashi pairs exceptionally well with dishes that have robust seasoning. Here are the most recommended uses.

Miso Soup: The Classic Niboshi Dashi Pairing

Niboshi dashi and miso are the golden combination of Japanese home cooking. The miso wraps around the rich umami of niboshi with a mellow sweetness, creating a flavor you can enjoy every day without getting tired of it.

• With red miso (aka miso): the boldness of niboshi complements the depth of red miso
• With blended miso (awase miso): creates a well-balanced, homestyle flavor
• Recommended ingredients: tofu, wakame seaweed, fried tofu (aburaage), green onion, daikon radish

Udon Broth

Udon broth made with niboshi dashi is a classic for Sanuki-style hot udon. Simply season niboshi dashi with soy sauce, mirin, and salt to create an authentic udon broth.

Ramen Broth

In recent years, niboshi ramen has been gaining popularity in Japan. The broth, which takes advantage of niboshi's rich umami, pairs well with soy sauce (shoyu) and salt (shio) flavored ramen. When making it at home, combining niboshi dashi with chicken bone broth creates a deeper, more complex soup.

Other Recommended Dishes

• Simmered dishes (nimono): Using niboshi dashi to simmer daikon or taro allows the deep umami to permeate the ingredients
• Mixed rice (takikomi gohan): Cooking rice with niboshi dashi infuses every grain with a gentle umami
• Okonomiyaki and takoyaki: Adding niboshi powder to the batter enhances the flavor

Comparison with Kombu Dashi and Katsuo Dashi

To better understand the characteristics of niboshi dashi, let us compare it with kombu dashi and katsuo dashi.

• Primary umami compound: Inosinic acid, Glutamic acid, Inosinic acid
• Flavor profile: Bold and rich, pronounced fish flavor, Gentle and refined, Elegant aroma, clean
• Best dishes: Miso soup, udon, ramen, Hot pot, simmered tofu, vegetarian dishes, Clear soup, chawanmushi, simmered dishes
• Preparation: Remove head and guts, Wipe the surface, None needed
• Ease of preparation: Requires some effort, Just soak, Add to boiling water
• Cost: Relatively affordable, Somewhat expensive, Moderate
• Storage: Cool dark place, several months, Cool dark place, long term, Use promptly after opening

Combination Tip

Niboshi dashi is delicious on its own, but combining it with kombu creates a synergistic umami effect. When you pair niboshi (inosinic acid) with kombu (glutamic acid), the perceived umami increases many times over compared to using either one alone. Simply soak kombu together with niboshi during the cold soaking process to give it a try.

Where to Buy in HCMC and Farmi's Niboshi-Related Products

Here is a summary of where to find niboshi and dashi ingredients in Ho Chi Minh City.

Where to Buy

• Farmi App: Order dashi packs, katsuobushi, kombu, and other Japanese dashi ingredients all in one place. Available in Japanese, with refrigerated delivery in as fast as one hour.
• Japanese supermarkets: AEON occasionally carries niboshi and granulated dashi. However, stock availability varies by location.
• Dried goods markets: Ben Thanh Market and An Dong Market also carry small dried fish, but note that the species and processing methods may differ from Japanese niboshi.

Dashi Ingredients Available on Farmi

On Farmi, you can order products related to niboshi dashi.

• Dashi packs: Pre-blended packs containing niboshi, kombu, and katsuobushi. Simply drop into hot water for authentic dashi
• Katsuobushi: Use together with niboshi dashi to create a more complex umami

Storage Tips for HCMC

In HCMC's hot and humid climate (average annual temperature of 28°C, humidity above 80%), proper storage of niboshi requires extra care.

• Unopened: Store away from direct sunlight in a cool place
• Opened: Place in a zip-lock bag, press out the air, and store in the refrigerator. Ideally, use within one month
• Long-term storage: Freezing can preserve niboshi for about three months. You can add them directly to water without thawing
• Prepared dashi: Keeps for 2 to 3 days refrigerated, or 2 to 3 weeks frozen

Frequently Asked Questions

Q1. Do I always have to remove the head and guts from niboshi? You can still make dashi without removing them, but the result will tend to be bitter and harsh. For miso soup, the miso covers the bitterness, so simply removing the head is sufficient when you are in a hurry. For delicate dishes like clear soup, thorough preparation is recommended.

Q2. What is the difference between niboshi dashi and granulated dashi? Natural dashi made from niboshi offers the authentic flavor of fish with deep umami. Granulated dashi is more convenient but has a simpler flavor profile. It is best to use natural dashi when you have time and granulated dashi when you are busy.

Q3. My niboshi dashi turns cloudy white. What should I do? This happens when the stock is boiled too vigorously on high heat. Bring it to a boil over medium heat, then reduce to low heat and simmer gently while carefully skimming the scum. If you want perfectly clear dashi, the cold soaking method is recommended.

Q4. Can niboshi dashi be used for baby food? Niboshi dashi with the head and guts thoroughly removed can be used for baby food. If you are concerned about salt content, prepare a more diluted version. However, if there is a risk of fish allergy, please consult a doctor before use.

Summary: Expand Your Japanese Cooking with Niboshi Dashi

Niboshi dashi has a unique charm with its bold, rustic umami that sets it apart from kombu and katsuobushi. Once you learn the simple preparation of removing the head and guts, anyone can make a clean, delicious dashi. From your daily miso soup to weekend udon and ramen, incorporating niboshi dashi will greatly expand your Japanese cooking repertoire.

Even in Ho Chi Minh City, dashi ingredients are easy to get through Farmi. Start with miso soup and give niboshi dashi a try.

Download the Farmi app and get your dashi ingredients delivered in as fast as one hour.

Related Articles

• How to Make Dashi: 4 Basic Types and How to Use Them in HCMC
• What Is Katsuobushi? The Umami Ingredient Behind Japanese Cuisine
• Essential Seasonings Guide for Japanese Cooking

Note: This article and some images were created with the assistance of AI (artificial intelligence) and reviewed by our editorial team before publication.