One course at a time, unhurried, with the window open
Heron Trident opened in September 2017 in a converted Victorian warehouse on Alderton Lane. Cassian Merle had spent the previous eleven years cooking in other people's restaurants, most recently as sous chef at Pellerin in Lyon, where he worked under a chef who refused to write a menu until the morning of service. That habit stayed with him. The first menu at Heron Trident was written on a Tuesday at 7 a.m., based on what had arrived from Fenwick Farm in Suffolk and a box of early-season ceps from a forager in the Wye Valley. It has been written the same way every week since.
The first two years were difficult in the way that most honest restaurants are difficult. The room was too cold in winter because the original heating system was inadequate for the ceiling height. The first pastry chef left after four months. The wine list was too long and too expensive and had to be cut by a third. What remained after those adjustments was something more coherent: a forty-two-cover room with a kitchen that knew what it was doing, a cellar that had been edited rather than accumulated, and a front-of-house team that had stopped trying to be everything to everyone. The Michelin inspector visited in February 2020, three weeks before the first lockdown. The letter arrived in October.
Menu written fresh every Monday morning, based on supplier deliveries
Forty-two covers only, no walk-ins accepted after 7 p.m.
The same sommelier, Edouard Voss, has managed the cellar since opening
No background music after 9 p.m. In the main dining room
Parallel tasting menu for dietary requirements, same length and care as the standard
— Margaret T.
Every ingredient on the menu carries a name and a place. We work with a small number of producers and change the menu when they tell us to, not the other way around.
The kitchen does not add what is not needed. A dish is finished when nothing further can be removed. This is the standard we hold ourselves to, service after service.
The same team has worked this room since 2017. The sommelier knows the cellar by memory. The front-of-house manager has greeted guests at the same door for seven years.
Every Monday morning, before the kitchen brigade arrives, Cassian Merle sits at the pass with a notebook and the week's delivery notes. The menu for the coming week is written in that session. It takes between forty minutes and two hours, depending on what arrived and what did not. This is how it works.
Read more →Turbot is on the Heron Trident menu more often than any other fish. Not because it is fashionable, but because when it is right, it is the most interesting fish in British waters. Getting it right depends almost entirely on how it was caught and how quickly it arrived. We have been working with the same Newlyn supplier since 2018, and the arrangement is simple: they call when the fish is exceptional, and we take it.
Read more →The sirloin on the Heron Trident a la carte is dry-aged for forty-two days in a cabinet in the kitchen. This is not the longest ageing period in London, and it is not intended to be. Forty-two days is the point at which this particular cut from this particular breed reaches the flavour and texture we are looking for. The number was arrived at through a process of tasting at intervals, not through reading about it.
Read more →“We have been coming to Heron Trident for four years, usually for our anniversary. The menu is never the same twice, which is the whole reason we keep returning. Last autumn the cep dish was the best thing I ate all year.
Margaret T. · Regular guest since 2021
“The private dining room is exactly what a private dining room should be. Quiet, unhurried, and the food was as good as anything in the main room. Edouard's wine pairings for our group were thoughtful without being showy.
James R. · Corporate lunch, March 2026
Cassian Merle trained at the Institut Paul Bocuse in Lyon, graduating in 2006. He spent three years at a Michelin-starred brasserie in Bordeaux before moving to London, where he worked the fish section at a well-regarded Mayfair restaurant for four years. His most formative period was a six-year tenure at Pellerin in Lyon, where he rose to sous chef under a chef known for refusing to write a menu before the morning of service. That discipline shaped his approach entirely. He returned to London in 2016 to open Heron Trident, which received its first Michelin star in 2020. Outside the kitchen, he keeps a small allotment in Hackney and reads agricultural journals with the same attention he gives to cookbooks.