The address arrives by text message at four in the afternoon: a third-floor flat above a locksmith in Hackney, buzzer marked only with a drawing of a fish. Inside, a single table runs the length of a former sewing workshop, laid for twelve with mismatched plates and jam jars of wild fennel. None of the guests have met. None have seen a menu. The host, a former line cook named Soraya Kettering, greets each arrival with a small glass of chilled sherry and the same instruction: sit next to someone you do not know.

This is Tidewater, one of a growing number of supper clubs that have moved from the fringes of the restaurant world toward its centre. Over the past two years, they have multiplied across London, Lisbon, Copenhagen and Mexico City, drawing chefs exhausted by the economics of restaurants and diners tired of the tasting-menu format, with its precise choreography and hushed reverence. What they offer instead is closer to a dinner party thrown by a talented friend, if the friend happened to be a professional cook.

The appeal is partly about food. Freed from the need to repeat a dish two hundred times a week, cooks can buy whatever the fishmonger has that morning and cook it once, with care. At Tidewater, the evening I attended began with raw scallops dressed in green strawberry and brown butter, moved through a whole roasted turbot carved at the table, and ended with a single enormous custard tart passed hand to hand. Nothing was plated with tweezers.

The table as the point

But the deeper appeal is social. Diners describe the experience less as a meal than as a temporary community, formed and dissolved in a single evening. Conversation is not an accompaniment to the food but its central purpose. Kettering seats guests deliberately, mixing ages, professions and levels of shyness, and she will quietly move a chair between courses if a corner of the table has gone silent. Several regulars told me they had made lasting friendships at her table.

A restaurant sells you a meal. I am trying to give people an evening they could not have planned.

In Lisbon, the rooftop supper club Casa Andorinha has taken the idea further, rotating guest cooks from across the Portuguese-speaking world each month and pricing seats on a sliding scale. Its founder, Beatriz Valente-Oduya, sees the format as an answer to the isolation of contemporary city life. “People move constantly now,” she says. “They arrive in a city knowing nobody. A long table is one of the oldest technologies we have for turning strangers into neighbours.”

The model has obvious limits. Supper clubs operate in a regulatory grey zone, their economics are fragile and their intimacy depends on scale, which makes growth almost impossible without losing the thing that made them special. Several of the best-known clubs of the last decade either closed or became conventional restaurants. The founders I spoke with were unbothered. Impermanence, they argued, is part of the point: a supper club is a moment, not an institution.

By midnight at Tidewater, the candles had burned down to stubs and the table had rearranged itself entirely. A retired judge was explaining sea-fishing techniques to a graphic designer. Two strangers were exchanging numbers to go swimming in the ponds. Kettering was washing plates in the tiny kitchen, singing along to the radio. Nobody had checked a phone in hours. As I left, she pressed a slice of leftover tart into my hands, wrapped in greaseproof paper, for the walk home.