Enjoy Travel to Japan!
Home

Aka Konnyaku in Omihachiman, Shiga: Why It’s Red, What It Tastes Like, and How to Eat

Aka Konnyaku in Omihachiman, Shiga: Why It’s Red, What It Tastes Like, and How to Eat
It looks bright red, but aka konnyaku is a mild Shiga specialty from Omihachiman—its color comes from chili, not heat. The texture is springy and perfect for simmered dishes, oden, or quick stir-fries. This guide explains why it’s red, what to expect in flavor, easy ways to eat it, and where to buy it as a local souvenir.

Highlights

Aka-konnyaku (Red Konjac) Basics

Aka-konnyaku (red konjac) is a specialty of Omihachiman in Shiga. Despite its vivid color, it has little to no spiciness and works well in simmered dishes and oden.

Why It’s Red

It’s not colored with Red Dye No. 〇 or similar food colorings; instead, it’s dyed using ferric oxide (iron oxide), a food additive.

Texture & Best Uses

It tends to be bouncier than regular konjac, sometimes quite firm depending on the product. It absorbs flavors well, making it a good fit for simmered dishes, stir-fries, sukiyaki, and oden.

Eat It As-Is

Because it has little odor or bitterness, it can also be sliced and eaten sashimi-style with wasabi soy sauce or ponzu.

History in Omihachiman

It’s said to have a tradition of more than 400 years and has become established around Omihachiman as part of local cuisine and foods for special occasions.

Where to Buy

It can be found at roadside stations in Omihachiman and in Shiga supermarkets, and is also sold by long-established shops such as Kawamotoya Honten and Nishikawa Konnyakuten.

Take-Home Tips

Many unopened products can be carried at room temperature, but it’s best to check the label for the recommended storage method and best-by date.

For the latest information, please refer to official announcements or check on site.

Shiga’s Traditional Food “Aka Konnyaku” — What’s the Secret Behind Its Vivid Red Color?

Japan has many types of konnyaku, but in Shiga Prefecture the standout is “Aka Konnyaku” (red konnyaku).

Unlike regular konnyaku, it has a striking bright red color—and in Ōmihachiman, “konnyaku means red” is the local norm.

In this article, we’ll introduce what Aka Konnyaku is, its history, delicious ways to eat it, and where to buy it!


What Is Aka Konnyaku? — A Traditional Food from Ōmihachiman, Shiga

1. Key Features of Aka Konnyaku

Aka Konnyaku is a unique food with a vivid brick-red to red color, different from typical konnyaku.

This red color is created using iron(III) oxide (ferric oxide), a food additive used for coloring.

Aka Konnyaku has a soft texture and absorbs flavors easily, making it great for simmered dishes, oden, and many other recipes.

Key facts Color vivid brick-red to redTexture soft and absorbs seasoning wellFlavor mild and works with many dishes

Common uses: simmered dishes, stir-fries, sukiyaki, oden, konnyaku sashimi.

Place of origin: Ōmihachiman City, Shiga Prefecture.

2. The Red Color Mystery — Why Is It So Red?

The source of Aka Konnyaku’s bright red color is iron(III) oxide (iron oxide).

It’s used as a food additive and applied according to product labeling and standards.

Making the most of konnyaku’s texture, Aka Konnyaku is enjoyed in a wide range of dishes such as simmered foods and oden.

The History of Aka Konnyaku and Its Connection to Ōmihachiman

1. Many Theories About Its Origin

Exactly when and why Aka Konnyaku began being dyed red is unclear—no definitive historical records remain, and multiple theories exist.

The most famous is the “Oda Nobunaga theory”: the story goes that the flamboyant Nobunaga, who built Azuchi Castle, even had konnyaku dyed red.

Another theory links it to Ōmihachiman’s traditional event the Sagichō Festival, saying it originated from Nobunaga wearing red garments while dancing.

There is also a theory that it was dyed red in the early Meiji period to celebrate victory in competition among konnyaku-producing areas within Shiga—each story has its own charm.

2. Established as a Local Food in Ōmihachiman

Centered around Ōmihachiman City in Shiga, Aka Konnyaku is deeply rooted in local food culture.

Locals affectionately call it “aka-kon,” and supermarket konnyaku sections are filled with red.

It’s indispensable for weddings and funerals, osechi (New Year foods), and festivals—used from everyday side dishes to special occasions.

It also appears in school lunches, making it a familiar taste for children in Shiga.


How to Eat Aka Konnyaku and Popular Recipes

1. Eat It as Is (Konnyaku Sashimi Style)

Aka Konnyaku has a mild flavor, so slicing it and eating it with wasabi soy sauce or ponzu is also recommended.

With its unique bounce, it also makes a low-calorie, healthy snack.

Because it looks a bit like liver sashimi, some people enjoy it as a “liver sashimi-style” bite.

2. Use It in Simmered Dishes and Stir-Fries

Since Aka Konnyaku absorbs seasoning well, it’s perfect for simmered dishes and stir-fries!

  • Using it as an ingredient in sukiyaki adds a colorful visual accent.
  • Adding it to oden makes it even tastier as it slowly soaks up flavor.

3. A Popular Aka Konnyaku Recipe

① Spicy Stir-Fried Aka Konnyaku

Ingredients:

  • Aka Konnyaku … 1 slab
  • Sesame oil … 1 tbsp
  • Soy sauce … 2 tbsp
  • Mirin … 1 tbsp
  • Sugar … 1 tsp
  • Chili pepper … 1

How to make:

  1. Cut Aka Konnyaku into bite-size pieces and briefly blanch in boiling water.
  2. Heat sesame oil in a pan and stir-fry the chili pepper and Aka Konnyaku.
  3. Add soy sauce, mirin, and sugar, then simmer-toss until coated.
  4. Once the flavor is absorbed evenly, it’s done!


Where to Buy Aka Konnyaku and Recommended Spots

1. Norimatsu Shokuhin Yoshii Shōten (Ōmihachiman)

  • Known as one of the makers of red konnyaku in Ōmihachiman, selling products rooted in local tradition.
  • Their direct shop sells a whole block of “Hachiman Aka Konnyaku,” as well as ito-konnyaku (konnyaku noodles), and red-and-white ball-shaped konnyaku, among other items.

2. Supermarkets and Souvenir Shops in Ōmihachiman

  • In Shiga supermarkets, red konnyaku is a standard item.
  • It can also be purchased at souvenir shops around Ōmihachiman Station and near Himure Hachimangū Shrine.

3. Available Online Too

Some Aka Konnyaku products can also be ordered via online shops.

The best-by date varies by product.

Traveler-Friendly Info

1. Pair It with Ōmihachiman Sightseeing

The Aka Konnyaku hometown Ōmihachiman has many historic attractions.

  • Hachiman-bori Canal (a scenic waterside stroll; also famous as a filming location)
  • Ōmihachiman Suigō (cruise experiences through the water town)
  • Himure Hachimangū (a historic shrine known for the Sagichō Festival)
  • Taneya Himure-no-Ya (a teahouse where you can enjoy set meals featuring red konnyaku)

2. How to Get to Ōmihachiman

  • From Kyoto: About 35 minutes on the JR Biwako Line (get off at Ōmihachiman Station)
  • From Osaka: About 1 hour 10 minutes by JR Special Rapid
  • From Nagoya: About 1 hour 30 minutes on the JR Tōkaidō Main Line

3. Tips for Taking It Home as a Souvenir

Some Aka Konnyaku products can be carried at room temperature, depending on the item.

Even if unopened, the best-by date is best confirmed via the product label.

After opening, please consume as soon as possible.

Summary

  • Aka Konnyaku is a traditional food from Ōmihachiman, Shiga!
  • It’s colored red using iron(III) oxide, creating a distinctive look.
  • Its history includes romantic stories, including a link to Oda Nobunaga.
  • It works in many dishes: sukiyaki, simmered foods, stir-fries, and sashimi-style.
  • Available from local makers, supermarkets, and online shops.

One Last Note

When you visit Shiga, be sure to try Aka Konnyaku!

It’s not only visually striking, but also a traditional food with a great texture and versatile flavor.

Enjoy it alongside a stroll through Ōmihachiman’s castle town atmosphere, and taste local Aka Konnyaku dishes along the way!

Frequently Asked Questions

A. Red konnyaku is a specialty of Omihachiman in Shiga Prefecture, often introduced as a local ingredient made by coloring konnyaku red. Even though the color looks strong, it isn’t spicy, so for a first try, simmered dishes or oden with dashi are an easy, approachable way to taste it.
A. Red konnyaku is konnyaku finished in red using food coloring and is loved as an Omihachiman specialty. It’s sometimes talked about alongside local festival culture where “red” stands out, such as the Sagicho Festival, but there are multiple explanations of its origin—so it’s best to enjoy the story while choosing based on taste.
A. Red konnyaku is introduced as keeping its color even when simmered, with a fine-textured, softer bite. The flavor itself is still konnyaku, so keeping the seasoning lighter can make the dashi stand out rather than overpowering it with overly strong broth.
A. In Shiga, simmered dishes featuring red konnyaku are introduced as local home-style cooking, and it’s an ingredient enjoyed year-round. If you’re cooking at home, dry-frying it first to remove moisture helps it absorb flavor more quickly and can give you a satisfying taste even on busy days.
A. Seasoned versions are travel-friendly because you can eat them as-is or use them in quick dressed dishes without cooking. Fresh konnyaku gives you more flexibility, so if you want to make dengaku or stir-fries after you get home, choosing fresh helps you use it up without getting bored.
A. If the typical konnyaku smell bothers you, blanching it and then dry-frying helps mellow it. Scoring a crosshatch pattern with a knife also helps seasoning soak in, and it looks great—making it a good fit for oden where the red color pops.
A. Konnyaku is made from the konjac plant (konnyaku potato) and is a Japanese staple enjoyed for its springy, jiggly texture. It’s sometimes served as a “lighter” alternative to meat, and it pairs well with Japanese-style flavors like dashi and soy sauce rather than heavy seasoning.
A. Because red konnyaku tastes clean and light, it balances well with richer street foods like Omi beef croquettes. If you want a sweet finish, eating the red-konnyaku item first can help “reset” your palate so desserts taste brighter.

Nearby Recommended Spots

Check out recommended articles in this area

※ The article content is based on information at the time of writing and may differ from the current situation. In addition, we do not guarantee the accuracy or completeness of the published content, please understand.