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WedOct 15

National Dashi Day – October 15, 2025

Have you ever experienced the rich, savory taste of dashi?

This October 15, we celebrate National Dashi Day, a day dedicated to honoring the simple yet profound broth that is the heart of Japanese cuisine. Sponsored by Kayanoya, a renowned manufacturer of authentic Japanese seasonings, this special day highlights the art of dashi, made from natural ingredients like kombu (kelp) and dried fish, which enhances the flavors of countless dishes. Whether you’re a seasoned home cook or new to Japanese cuisine, National Dashi Day is the perfect time to explore the depth and versatility of dashi in your kitchen.

And this year, Kayanoya USA invites you to join the celebration by learning more about dashi and exploring their crafted seasonings to bring the authentic taste of Japan into your home! To mark this occasion, Kayanoya will be offering a special limited-time promotion*, the first orders will receive a complimentary set of white bamboo chopsticks, crafted in collaboration with Takano Chikko of Kyoto, Japan, along with a sample of Umami Dashi and Sauce for Pasta to enhance your culinary experience.

*Promotion valid from October 15th through the 17th with a minimum purchase of $75 USD. Complimentary set available while supplies last, please check Kayanoya’s website for more information.

History of National Dashi Day

Dashi, a staple in Japanese cuisine, traces its origins back over 800 years to the early Heian period. This delicate broth was first crafted by simmering kombu (kelp) and dried fish to extract a subtle umami flavor that became essential in Japanese cooking. The creation of dashi marked the beginning of Japan’s focus on simple, ingredient-driven cuisine, where natural flavors were highlighted.

During the Edo period (1603-1868), descriptions of dashi began to appear in various literature and Japanese cookbooks. It was during this time in the Kansai region (Kyoto & Osaka) that awase dashi—a combination of kombu and katsuobushi (dried bonito flakes)—became popular and gradually spread to the Tokyo area (formerly Edo), where dried sardines or dried bonito were traditionally used to make dashi. This blend of kombu and katsuobushi offered a more complex umami profile and was incorporated into traditional dishes like miso soup, nimono (simmered dishes), and noodle broths. However, different regions of Japan have used other types of fish with kombu to make awase dashi. In Kyushu, for example, ago (flying fish) is commonly used, imparting a clean, refined flavor characteristic of the region’s dashi.

Regional differences in dashi preparation are often attributed to water hardness, with Kansai’s soft water allowing kombu’s delicate flavors to shine and Kanto’s harder water resulting in a stronger dashi made with more katsuobushi. However, beyond water hardness, other factors played a significant role. The development of domestic trade routes, particularly the Kitamaebune shipping route, facilitated the transport of kombu from Hokkaido to Kansai. Regional taste preferences have also influenced dashi: Kansai traditionally favors lighter, more refined flavors, while Kanto is known for stronger, richer tastes. 

The unique flavor profile of dashi was formally recognized in 1908, when Japanese researcher Kikunae Ikeda identified glutamate, extracted from kombu (kelp), as the key component responsible for dashi’s distinct taste. He coined the term “umami,” which became known as the fifth basic taste alongside sweet, sour, salty, and bitter. The discovery of umami, directly associated with dashi, revolutionized the understanding of flavor in both Japanese and global cuisines. 

As Japan industrialized in the 20th century, instant dashi products became widely available, making it easier for home cooks to replicate the rich flavors of traditional dashi. 

Today, dashi remains a symbol of Japanese culinary heritage, cherished for its simplicity and versatility. As Kayanoya marks National Dashi Day, we celebrate the profound impact this humble broth has had on Japanese cuisine. In Kyushu, a key regional variation of dashi includes “ago” (flying fish), which is dried and used as a primary ingredient for its clean, refined flavor. This tradition is honored through the annual “Ago Festival” in Fukuoka, held during the peak season for flying fish. The festival draws large crowds each year, where visitors enjoy freshly caught, charcoal-grilled flying fish and other dashi-based dishes.

National Dashi Day timeline

12th Century
Early Beginnings

The roots of dashi can be traced back to Japan’s Heian period, where simple broths are made using natural ingredients like kombu (kelp) and dried fish to enhance flavors.

1603-1868
Edo Period Expansion

During the Edo period, dashi becomes a cornerstone of Japanese cuisine, used in dishes such as miso soup, simmered vegetables, and stews, solidifying its role as the foundation of umami-rich cooking. Around this time, various regional dashi cultures emerge throughout Japan. In the Kyushu region, "ago dashi," made from dried flying fish, is developed. By the mid-Edo period, ago dashi gains popularity among common people and is often featured in celebratory New Year’s dishes.

1908
The Birth of Umami

Japanese researcher Kikunae Ikeda identifies glutamate as the key to dashi’s distinct savory taste and coins the term "umami." This fifth basic taste, alongside sweet, sour, salty, and bitter, forever changes the understanding of flavor in cuisine.

19th Century
Refinement and Popularization

As Japan’s culinary techniques evolve, dashi is refined, with katsuobushi (dried bonito flakes) and shiitake mushrooms becoming popular ingredients. These ingredients bring additional depth to the broth, enhancing its versatility and appeal in both home cooking and professional kitchens.

1920s
Commercial Production

The early 20th century sees the first large-scale production of dried bonito and kombu, making dashi accessible to more people across Japan. Pre-packaged dashi becomes available in markets, allowing home cooks to quickly prepare the beloved broth.

Late-19th Century
Global Recognition

Dashi gains global recognition as a key element of Japanese cuisine, celebrated for its simplicity and rich umami flavor. It is widely used by chefs and home cooks around the world, bringing traditional Japanese flavor to modern dishes.

2024
National Dashi Day

To celebrate this centuries-old broth, Kayanoya marks National Dashi Day, encouraging people to explore the heritage and flavors of dashi and its essential place in Japanese cuisine.

National Dashi Day FAQs

What is dashi, and why is it important in Japanese cuisine?

Dashi is a traditional Japanese broth made from simmering kombu (kelp), bonito flakes (dried fish), or other ingredients like shiitake mushrooms. It serves as the foundation for many Japanese dishes, from soups to sauces, and enhances the umami flavor in foods. Dashi’s simplicity and versatility make it a staple in both home cooking and professional kitchens​.

How is dashi typically used in cooking?

Dashi is used as the base for soups like miso soup and broths for noodle dishes such as ramen, udon, and soba. It’s also a key ingredient in simmered dishes like nimono (vegetables or meat simmered in a dashi-based sauce) and dipping sauces for tempura and cold noodles​. Kayanoya’s dashi powder can also be directly added to your favorite dishes, bringing a surprising boost of umami flavor.

Can I make dashi at home, or should I buy it pre-made?

You can make dashi at home using kombu and bonito flakes, but the process takes some time and effort. It typically involves soaking kombu for at least 50 minutes to an hour, and sometimes even overnight. While homemade dashi provides great flavor, Kayanoya’s mission is to offer an easier yet premium alternative. Their dashi stock powders and liquid concentrates save time, providing the same rich, umami flavor with less effort, making them perfect for quick and delicious meals.

What are the different types of dashi?

There are several types of dashi, each offering a unique flavor profile. The most common are kombu dashi (made from kelp) and katsuobushi dashi (made from dried bonito flakes). Other variations include shiitake dashi (from mushrooms), ago dashi (from flying fish), and niboshi dashi (from dried sardines). The combination of kombu and bonito is called awase dashi, and is considered the most balanced and flavorful​.

National Dashi Day Activities

  1. Explore authentic dashi cooking with Kayanoya

    Celebrate National Dashi Day by trying out some authentic Japanese dashi recipes! Whether you’re making miso soup or simmered vegetables, Kayanoya’s dashi seasonings offer the perfect blend of flavors. Be sure to check out Kayanoya's special promotion, making it easier than ever to try their premium dashi at home.

  2. Attend a dashi festival in Japan

    If you’re in Japan, consider taking part in one of the festivals celebrating dashi, such as the popular “Ago Festival” in Fukuoka, hosted by the Kubara Honke Group, Kayanoya’s parent company. While the festival is not held annually and the dates may vary, it offers a wonderful opportunity to enjoy grilled flying fish, learn about the seasonal ingredients that go into dashi, and savor delicious dashi-based dishes while soaking up the festive atmosphere. For the latest news and event information about Ago Festival, please visit Kayanoya’s official news page (in Japanese).

  3. Share the dashi love

    National Dashi Day is the perfect excuse to introduce friends and family to the wonders of dashi. Host a dinner featuring dashi-based dishes or gift someone a dashi set. You can even encourage them to take advantage of Kayanoya's special promotions to start their own dashi journey!

5 Facts About Kayanoya

  1. A tradition born in 1893

    Kubara was founded over 130 years ago on Kyushu's southern Japanese island as a small soy sauce brewery. In 2005, Kubara established Kayanoya to expand its offering of premium seasonings. While the brand has grown, its commitment to authentic Japanese flavors and craftsmanship remains at the heart of everything they do.

  2. Convenient dashi for home use

    Inspired by customer feedback from their restaurant, Kayanoya created the “Kayanoya Dashi” series, allowing customers to enjoy the same authentic flavors at home. Their dashi is easy to prepare, offering convenience without sacrificing quality.

  3. Crafted with premium ingredients

    Kayanoya is all about quality. They personally visit their fishing partners across Japan to handpick the best ingredients for their products. From rich, flavorful dashi to authentic seasonings, everything is made with care to bring out the bold, natural flavors that make their dishes stand out. It's all about bringing that premium taste straight to your kitchen!

  4. A commitment to slow food

    Kayanoya operates a “slow food” restaurant that emphasizes fresh, seasonal ingredients and traditional Japanese cooking methods. The philosophy behind the restaurant is rooted in the belief that flavor takes time and hard work. The restaurant serves as an inspiration for their product lines, ensuring that home cooks can replicate authentic dishes with ease.

  5. Versatility across global cuisines

    Kayanoya’s premium seasonings are not only perfect for traditional Japanese dishes but are also highly adaptable to enhance the flavors of a variety of global cuisines. Whether you’re preparing Italian pasta, French soups, or Mexican stews, Kayanoya seasonings bring a unique depth of flavor, making them a versatile addition to any kitchen.

Why We Love National Dashi Day

  1. It’s the heart of Japanese cuisine

    Dashi is the foundation of countless Japanese dishes, from comforting miso soup to rich ramen broths. National Dashi Day is a perfect time to appreciate how this simple broth brings out the best in fresh ingredients and enhances umami flavors in cooking.​

  2. A delicious and healthy choice

    Dashi is not only flavorful but also nutritious. Made with natural ingredients like kombu and bonito flakes, it’s packed with health benefits like amino acids for protein formation. Celebrating dashi means enjoying a wholesome and healthy meal.

  3. Easy to enjoy at home

    With Kayanoya’s premium dashi products, making authentic dashi at home is easier than ever. Whether you’re a seasoned chef or new to Japanese cooking, National Dashi Day offers a great opportunity to try this flavorful broth in your own kitchen​.

National Dashi Day dates

Year Date Day
2025 October 15 Wednesday
2026 October 15 Thursday
2027 October 15 Friday
2028 October 15 Sunday
2029 October 15 Monday