# Mixed katsu set with giant shrimp tempura and mini udon: Kosi Seongsu

- By Sion (https://superchart.com/en/@meal-postcard-seoul/)
- Written Sep 9, 2026
- Local places › Restaurants › Seongdong, Seoul
- Sponsored: This story was written after a sponsored restaurant visit.
- English edition: https://superchart.com/en/@meal-postcard-seoul/koshi-seongsu-mixed-katsu-set/
- Also in: [한국어](https://superchart.com/ko/@meal-postcard-seoul/koshi-seongsu-mixed-katsu-set/index.md)

## In short

Kosi Seongsu Branch is a handmade Sanuki udon and Japanese tonkatsu restaurant on the first floor of a brick building in Seongdong, Seoul. The mixed katsu set brought golden loin cutlet, a whole head-to-tail giant shrimp tempura, and a complimentary mini udon in bonito broth, while the bukkake udon set showed off chewy self-made noodles with chicken karaage and inari sushi. The noodles kept their bounce and the tempura stayed crisp to the last bite, making this an easy pick for a date or a solo meal.

## Good to know

- **Location**: 1F, 31 Sangwon 1-gil, Seongdong-gu, Seoul (brick building)
- **Ordering**: Contactless tablet order at every table
- **Seating**: Wood tables for 2 to 4 people
- **Dishes tried**: Bukkake udon set (chicken karaage, inari sushi), mixed katsu set
- **Table extras**: Sesame grinder, salad dressing

*as written by the visitor on Sep 9, 2026*

![First photo from the visit to Kosi Seongsu Branch](https://img.superchart.com/images/koshi-seongsu-mixed-katsu-set/koshi-seongsu-mixed-katsu-set-01-i7f2n-900.webp)

I visited Kosi Seongsu Branch, which has been building a word-of-mouth reputation in the alleys of Seongsu-dong for its authentic handmade Sanuki udon and crispy Japanese tonkatsu.

## Exterior and cozy interior

![Exterior of Kosi Seongsu Branch on the first floor of a brick building](https://img.superchart.com/images/koshi-seongsu-mixed-katsu-set/koshi-seongsu-mixed-katsu-set-02-pam17-900.webp)

Set on the first floor of a brick building, the restaurant gives off a warm, comfortable Japanese-dining vibe right from the entrance, with warm wood tones and soft lighting.

The signboard outside neatly lists the signature dishes — ten bukkake udon, mazeudon, mixed katsu — with photos, which really gets the appetite going before you even step in.

![Signboard outside the restaurant showing signature menu items](https://img.superchart.com/images/koshi-seongsu-mixed-katsu-set/koshi-seongsu-mixed-katsu-set-03-11kni-900.webp)

![Warm wood-toned interior at the entrance](https://img.superchart.com/images/koshi-seongsu-mixed-katsu-set/koshi-seongsu-mixed-katsu-set-04-1rig9-900.webp)

Inside, it's tidy and clean, mainly wood tables, with a comfortable mix of seating for two up to four people!

![Interior of the restaurant with wood tables](https://img.superchart.com/images/koshi-seongsu-mixed-katsu-set/koshi-seongsu-mixed-katsu-set-05-wa7ns-900.webp)

![Dining hall with seating for two and four people](https://img.superchart.com/images/koshi-seongsu-mixed-katsu-set/koshi-seongsu-mixed-katsu-set-06-4zixy-900.webp)

![Tablet ordering screen on the table](https://img.superchart.com/images/koshi-seongsu-mixed-katsu-set/koshi-seongsu-mixed-katsu-set-07-fnu68-900.webp)

Every table has a contactless tablet ordering system, so you can browse menu photos and order right from your seat, haha.

![Sesame grinder and salad dressing on the table](https://img.superchart.com/images/koshi-seongsu-mixed-katsu-set/koshi-seongsu-mixed-katsu-set-08-vlct7-900.webp)

On the side of each table there's a sesame grinder and salad dressing you can add to taste, which is nice and convenient.

## Bukkake udon set (chicken karaage & inari sushi)

![Full spread of the bukkake udon set](https://img.superchart.com/images/koshi-seongsu-mixed-katsu-set/koshi-seongsu-mixed-katsu-set-09-108qo-900.webp)

To really put this Sanuki udon specialist's skills to the test, I ordered the bukkake udon, a refreshing cold udon eaten mixed together.

![Coiled handmade bukkake udon noodles](https://img.superchart.com/images/koshi-seongsu-mixed-katsu-set/koshi-seongsu-mixed-katsu-set-10-4l30x-1200.webp)

Being handmade noodles, they're coiled into a pretty spiral shape, and even at a glance you can see the glossy sheen.

![Close-up of cold udon topped with tsuyu and garnishes](https://img.superchart.com/images/koshi-seongsu-mixed-katsu-set/koshi-seongsu-mixed-katsu-set-11-1a4jn-900.webp)

They feel as if just rinsed in ice-cold water — bouncy and firm, with that distinctive heavy, chewy Sanuki texture on every bite.

I poured the tsuyu from the little gourd-shaped pot evenly over the noodles, piled on scallions, grated radish and crispy tempura bits, then squeezed a bit of lemon juice and mixed it all together — the result is a savory yet refreshing umami that fills your whole mouth...!!

![Chicken karaage, inari sushi, and cabbage salad](https://img.superchart.com/images/koshi-seongsu-mixed-katsu-set/koshi-seongsu-mixed-katsu-set-12-5jsy9-900.webp)

The set comes with three big, crispy boneless chicken karaage pieces that pair well with the noodles, plus generous sweet-savory braised inari sushi and cabbage salad — a filling spread on its own.

## The ultimate in crispiness! Mixed katsu set

![Full spread of the mixed katsu set](https://img.superchart.com/images/koshi-seongsu-mixed-katsu-set/koshi-seongsu-mixed-katsu-set-13-41qq1-900.webp)

This is the mixed katsu set, where you can taste crispy breading and juicy meat at the same time.

![Golden-breaded loin cutlet](https://img.superchart.com/images/koshi-seongsu-mixed-katsu-set/koshi-seongsu-mixed-katsu-set-14-513r3-900.webp)

The loin cutlet in its golden breading is crisp on the outside and, on the inside,

![Cross-section of a piece of loin cutlet](https://img.superchart.com/images/koshi-seongsu-mixed-katsu-set/koshi-seongsu-mixed-katsu-set-15-1gbne-900.webp)

![Loin cutlet piece held with chopsticks](https://img.superchart.com/images/koshi-seongsu-mixed-katsu-set/koshi-seongsu-mixed-katsu-set-16-1e9ra-900.webp)

holds moist juices, chewing soft with no off flavor.

![Giant shrimp tempura fried whole from head to tail](https://img.superchart.com/images/koshi-seongsu-mixed-katsu-set/koshi-seongsu-mixed-katsu-set-17-1s28a-900.webp)

The giant shrimp tempura, fried whole from head to tail (I'm guessing black tiger shrimp...?), felt

![Shrimp tempura dipped in tartar sauce](https://img.superchart.com/images/koshi-seongsu-mixed-katsu-set/koshi-seongsu-mixed-katsu-set-18-4ueyd-900.webp)

noticeably heavy when I picked it up with chopsticks, the flesh so plump and full — dipping it in tartar sauce was such a treat, haha.

![Mini udon in bonito broth included with the set](https://img.superchart.com/images/koshi-seongsu-mixed-katsu-set/koshi-seongsu-mixed-katsu-set-19-1397i-900.webp)

A warm, deep bonito-broth mini udon comes included with the set as standard, cutting through the richness of the fried dishes nicely.

![White rice sprinkled with furikake](https://img.superchart.com/images/koshi-seongsu-mixed-katsu-set/koshi-seongsu-mixed-katsu-set-20-12le4-900.webp)

Fluffy white rice sprinkled with furikake seasoning is served too, so

![Mixed katsu set nearly finished](https://img.superchart.com/images/koshi-seongsu-mixed-katsu-set/koshi-seongsu-mixed-katsu-set-21-19pk0-900.webp)

you can clean the plate right down to the last bite.

## To sum up

If you want to properly experience the charm of freshly made, chewy handmade udon noodles in Seongsu-dong, this is a place you won't regret. The refreshing chewiness of the bukkake udon and the hearty crispiness of the mixed katsu balance each other beautifully for a satisfying, filling meal.

Thanks to the neat plating and cozy space, it works just as well for a date as it does for eating alone — no pressure either way. What stood out most was how the noodles kept their bounce and the tempura kept its crunch all the way through the meal.

From the basic side dishes to the extras, you can tell real care went in, and you get the depth of authentic Japanese noodle cooking at a reasonable price — a genuinely great restaurant I'd happily revisit in Seongsu-dong.

## Where it is

- Kosi Seongsu Branch (코시 성수점)
- 31 Sangwon 1-gil, Seongdong-gu, Seoul, South Korea (1F)
- 서울특별시 성동구 상원1길 31 1층
- 37.5464155, 127.0474867
- Google Maps: https://www.google.com/maps/search/%EC%BD%94%EC%8B%9C%20%EC%84%B1%EC%88%98%EC%A0%90/@37.5464155,127.0474867,17z

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