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Seasoned Indian Restaurateurs Lean Into Pricey Protein and Volcanoes for New Mayfair ‘Izakaya’

Samyukta and Dinesh Nair have been in the wealthy neighbourhood long enough to know that there is no such thing as too much raw fish, grilled meat, or citrus. Koyn will open in September

A selection of sashimi at Koyn, including tuna and salmon
A selection of sashimi at Koyn
Koyn/Official Photo

A Very Mayfair Restaurant will open in Mayfair this September, as the restaurateurs behind Jamavar, MiMi Mei Fair, Bombay Bustle, and Socca will open what they are referring to as an “izakaya” in the former U.S. Embassy on Grosvenor Square. In reality, father-daughter duo Samyukta and Dinesh Nair will aim to replicate a series of successful Mayfair — Sexy Fish, Nobu — restaurants and play safe with expensive cuts of lean grilled meat, good raw seafood, and a surfeit of citrus-based seasonings. This is lowest common-denominator dining in the highest of high net-worth neighbourhoods.

KOYN, first revealed by the Evening Standard, is described as “a modern Japanese restaurant inspired by the nature-spirited roots and duality of Mount Fuji.” An establishment which “will adapt Japan’s ancient appreciation of balancing modernity with tradition alongside simplicity and harmony into a two-fold contemporary dining experience.” An izakaya — essentially a pub and grill — this is not.

For clarity, it’s worth including the restaurant’s rationale — issued in a press release — in full.

KOYN’s philosophy places value on subtlety and detail through an amalgamative lens where art, design and textile traditions meet culinary craftsmanship. As guests approach the restaurant, large picture windows framed with ombre-dyed noren blinds will announce their arrival, while planters of traditional Japanese grasses provide a breath of asymmetrical organic energy.

The Nairs and their designer, Tom Strother of Fabled Studio, will seek to “symbolise the complementary forces at play in Japan’s enigmatic volcano, where a lush alpine environment peacefully co-exists with the fires raging below. This balance between calm and volatile energy will be reflected in the two distinct yet streamlined ~spheres~ of the restaurant.”

First, “Midori”, the green room, “inspired by the landscape of Japanese zen gardens and the striking pink moss growing on the fertile volcanic soil of Mount Fuji” and “representative of vegetative life on the snowcapped peaks”. This sits above Magma — or “the charred room, representing an active, bubbling volcano.”

On the pans is chef Rhys Cattermoul, who, naturally, will contrive a menu inspired by the “natural duality” underpinning the restaurant “to showcase the broad spectrum of Japanese cuisine through rich umami flavours and locally sourced produce.” Cattermoul is from Auckland in New Zealand, and apparently discovered his passion for food whilst briefly working at Michelin-Starred restaurant the Greenhouse, which was among the most high-profile casualties during the COVID-19 lockdown in 2020.

He later worked at Nobu, where he eventually became head chef, before moving to run Nobu in Hong Kong. At Koyn, Cattermoul will create plates like steamed clams ‘nabe’ with cordycep mushroom, yuzu sake soy, as well as red mullet tempura with yuzu kosho tosazu and homemade kombu salt.

Samyukta Nair said in a statement that she was “thrilled to be carving our own unique perspective on Japanese cuisine with KOYN. I have long admired Japan for its understated elegance, expertly-made craft and philosophy that balances modernity with tradition.

“While working with Rhys on this project I’ve been able to get a deeper understanding of Japanese culture through our food journey.”

KOYN’s unnamed resident sushi master will offer “signature classic” mouthfuls, such as native lobster tempura sushi roll with chargrilled red pepper and creamy yuzu lemon; plus an Applewood-smoked Japanese A5 Kagoshima wagyu sushi roll with asparagus, kanpyo, and black truffle.

Meanwhile, on the lower ground floor is where guests can find “Magma,” a room described thus: “an immersive subterranean space enveloped within the dark volcanic heart of Mount Fuji.”

It is here that traditional binchotan-charcoal-fuelled robata grill, crafted from black slatted timber and rainforest marble, of course. This focal point will be lined with burnt orange leather stools, from which guests “are close enough to feel the heat of the flames.” (It isn’t clear whether the leather stools are in fact actually burnt.)

Nevertheless, hyper specificity and bamboozlement is the name of the game here, too where dishes will include the likes of hojicha-smoked lamb marinated with spicy kuromame miso; or hispi cabbage grilled with homemade koji dressing; as well as wagyu ishiyaki, served on a sizzling hot stone.

Check back for a dispatch from the hot stools in the autumn.


8 Mount Street, , England W1K 3NF 020 7499 1800 Visit Website

The Greenhouse

8 Carrer de Bergara, , CT 08002 Visit Website

Sexy Fish

Berkeley Square House, Berkeley Square, London, W1J 6BR Visit Website

Bombay Bustle

29 Maddox Street, , England W1S 2PA 020 7290 4470 Visit Website