# Fish cake udon with grilled chikuwa near Isu Station: Kosi Isu Branch

- By Hojun (https://superchart.com/en/@seoul-bite-index-2/)
- Written Sep 20, 2026
- Local places › Restaurants › Dongjak, Seoul
- Sponsored: This visit was sponsored by the business.
- English edition: https://superchart.com/en/@seoul-bite-index-2/kosi-isu-oden-udon-tempura-set/
- Also in: [한국어](https://superchart.com/ko/@seoul-bite-index-2/kosi-isu-oden-udon-tempura-set/index.md)

## In short

Kosi Isu Branch is a house-made noodle udon and Japanese tonkatsu restaurant near Exit 9 of Isu Station in Dongjak, Seoul. On the way home from work the writer ordered odeng udon (fish cake udon) for 16,000 won with a 5,000 won extra tonkatsu, and tenbukkake udon for 15,000 won with a 4,000 won tempura set. At Kosi Isu Branch the warm fish cake broth, the grilled chikuwa and the crisp tempura were all worth the stop.

## Good to know

- **Location**: Near Isu Station Exit 9 (1F, Units 126–127, 300 Sadang-ro, Dongjak-gu, Seoul)
- **Odeng udon (fish cake udon)**: 16,000 won
- **Extra tonkatsu**: +5,000 won (pork loin cutlet, generous portion)
- **Tenbukkake udon**: 15,000 won
- **Tempura set add-on**: +4,000 won (perilla leaf, sweet pumpkin, small shrimp tempura)
- **Included with every dish**: One inari sushi (fried tofu rice pocket)
- **Seating**: Fairly large dining hall, fine for solo diners and families
- **Price reference**: ₩16,000 ≈ $11.5 · ₩5,000 ≈ $3.6 · ₩15,000 ≈ $11 (2026-09-20)

*as written by the visitor on Sep 20, 2026*

![A full spread of udon and tonkatsu at Kosi Isu Branch](https://img.superchart.com/images/kosi-isu-oden-udon-tempura-set/kosi-isu-oden-udon-tempura-set-01-17rub-1200.webp)

Kosi's cold udon spot was already amazing when I visited before, but the more I eat here, the more I fall for the warm udon, tonkatsu, and tempura too. On my way home from work, craving some chewy udon, I stopped by Kosi near Isu Station.

![Exterior of Kosi Isu Branch near Isu Station Exit 9](https://img.superchart.com/images/kosi-isu-oden-udon-tempura-set/kosi-isu-oden-udon-tempura-set-02-acm6y-966.webp)

## Where is Kosi Isu Branch? Isu Station Exit 9

Kosi is a well-known udon chain with several branches, and the one I visited is Kosi Isu Branch, near Exit 9 of Isu Station.

![Entrance and menu signage at Kosi Isu Branch](https://img.superchart.com/images/kosi-isu-oden-udon-tempura-set/kosi-isu-oden-udon-tempura-set-03-1gau3-966.webp)

The udon is great, but the tempura and Japanese-style tonkatsu are both delicious too, so I came back for another visit.

![Sign about Kosi's house-made noodles](https://img.superchart.com/images/kosi-isu-oden-udon-tempura-set/kosi-isu-oden-udon-tempura-set-04-e5k65-966.webp)

## House-made udon noodles and the dining hall at Kosi Isu Branch

Kosi is famous for its house-made noodles, made with nothing but salt, water, and flour. This isn't just hand-pulled noodles for show — they're genuinely chewy and delicious.

![The spacious dining hall seating at Kosi Isu Branch](https://img.superchart.com/images/kosi-isu-oden-udon-tempura-set/kosi-isu-oden-udon-tempura-set-05-psrgp-966.webp)

The dining hall is fairly large. It works for solo dining as well as families — and indeed, there were solo diners and families of various sizes eating there.

![Odeng udon served together with extra tonkatsu](https://img.superchart.com/images/kosi-isu-oden-udon-tempura-set/kosi-isu-oden-udon-tempura-set-06-dcxo1-966.webp)

## Fish cake udon 16,000 won plus extra tonkatsu 5,000 won

The odeng udon (fish cake udon) costs ₩16,000. I added ₩5,000 for the extra tonkatsu, too. For just ₩5,000 more, you get a pretty generous portion of loin cutlet alongside.

![Odeng udon topped with chikuwa and round fish cake](https://img.superchart.com/images/kosi-isu-oden-udon-tempura-set/kosi-isu-oden-udon-tempura-set-07-19551-966.webp)

The odeng udon features warm udon with tempura flakes and kelp mixed in, topped with round fish cake and lightly grilled chikuwa (tube-shaped fish cake).

![Warm udon broth with kelp and tempura flakes](https://img.superchart.com/images/kosi-isu-oden-udon-tempura-set/kosi-isu-oden-udon-tempura-set-08-12p0n-966.webp)

Kosi's warm udon broth is refreshing yet clean-tasting. It has that classic Japanese-style savory udon flavor, plus the clean taste from the kelp — you just keep eating it. The seasoning is perfectly balanced too.

![Chewy house-made noodles in warm broth](https://img.superchart.com/images/kosi-isu-oden-udon-tempura-set/kosi-isu-oden-udon-tempura-set-09-ok27r-966.webp)

Chewy noodles sitting in the warm udon. Even in hot broth, this chewy house-made noodle holds up beautifully.

![Udon noodles lifted up with chopsticks](https://img.superchart.com/images/kosi-isu-oden-udon-tempura-set/kosi-isu-oden-udon-tempura-set-10-1dzpk-966.webp)

The lightly grilled chikuwa has a nice springy texture, and the round fish cake is soft and tasty, though it's a more familiar flavor overall. I think grilling chikuwa like this is a great idea.

![Extra loin tonkatsu added for ₩5,000](https://img.superchart.com/images/kosi-isu-oden-udon-tempura-set/kosi-isu-oden-udon-tempura-set-11-119t4-966.webp)

### How the extra tonkatsu tastes with salt and wasabi

I ordered the extra tonkatsu because I was craving cutlet. The batter is crispy and clean, while the loin inside is chewy and springy. If I hadn't already committed to udon, I probably would have just ordered tonkatsu outright.

![Cross-section of loin tonkatsu with salt and wasabi](https://img.superchart.com/images/kosi-isu-oden-udon-tempura-set/kosi-isu-oden-udon-tempura-set-12-j872x-966.webp)

The tonkatsu itself is so good that it's delicious dipped in just salt, and equally delicious piled high with wasabi.

![A generously sized inari sushi served with the meal](https://img.superchart.com/images/kosi-isu-oden-udon-tempura-set/kosi-isu-oden-udon-tempura-set-13-1cysc-966.webp)

Every dish comes with one inari sushi. It's bigger than expected and packed with rice. The seasoning isn't too salty either — just right, filling, and tasty.

![Tenbukkake udon served with the tempura set](https://img.superchart.com/images/kosi-isu-oden-udon-tempura-set/kosi-isu-oden-udon-tempura-set-14-10kam-966.webp)

## Tenbukkake udon 15,000 won plus tempura set 4,000 won

The tenbukkake udon costs ₩15,000. I added ₩4,000 for the tempura set, which comes as a separate plate of tempura.

![Tenbukkake udon topped with shrimp and pumpkin tempura](https://img.superchart.com/images/kosi-isu-oden-udon-tempura-set/kosi-isu-oden-udon-tempura-set-15-hyiqu-966.webp)

Tenbukkake udon is a cold bukkake-style udon topped with various garnishes, sweet pumpkin tempura, and a really large piece of shrimp tempura.

You pour the tsuyu sauce, served separately, generously over the cold noodles to complete the bukkake udon.

![Bukkake udon after the tsuyu sauce is poured on](https://img.superchart.com/images/kosi-isu-oden-udon-tempura-set/kosi-isu-oden-udon-tempura-set-16-17sn4-966.webp)

The tsuyu is savory with a bright citrusy note, like yuzu or green citrus. The noodles are, of course, cold and refreshing, and that chill makes it even more addictive.

![Cold bukkake udon noodles](https://img.superchart.com/images/kosi-isu-oden-udon-tempura-set/kosi-isu-oden-udon-tempura-set-17-cdrq7-966.webp)

On top of the bukkake udon sits shrimp tempura — a big shrimp, fried crispy and delicious.

![A large shrimp tempura placed on top of the udon](https://img.superchart.com/images/kosi-isu-oden-udon-tempura-set/kosi-isu-oden-udon-tempura-set-18-1opv3-966.webp)

The tempura set add-on comes with perilla leaf, sweet pumpkin, and small shrimp tempura, plus of course another inari sushi. The shrimp tempura here is smaller than the one on the udon, but it's fried so well that anyone who loves tempura should consider adding the set.

![Tempura set with perilla leaf, sweet pumpkin, and shrimp tempura](https://img.superchart.com/images/kosi-isu-oden-udon-tempura-set/kosi-isu-oden-udon-tempura-set-19-1chx8-966.webp)

## What to order next time at Kosi Isu Branch

I'd like to try the cheese katsu and beef bowl (gyudon) the table next to me was having, but it seems like every time I come, I can't resist the pull of the udon.

## Where it is

- Kosi Isu Branch (코시 이수점)
- 300 Sadang-ro, 1F Units 126–127, Dongjak-gu, Seoul, South Korea
- 서울특별시 동작구 사당로 300 1층 126호, 127호
- 37.4844642, 126.9808303
- Google Maps: https://www.google.com/maps/search/%EC%BD%94%EC%8B%9C%20%EC%9D%B4%EC%88%98%EC%A0%90/@37.4844642,126.9808303,17z

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