A pop-up restaurant in London is serving gourmet fish from gorgeous tins in designer surroundings. Are you a fan of the can – and would you pay someone to open it for you?

We’ve had the silent restaurant, the restaurant for one and the cat cafe. Now a new restaurant has opened with no chef and no kitchen. It doesn’t need either because it only sells tinned fish. That’s right, the stuff that Grandad ate with two slices of white bread and stewed tea. Or is it?

“The perception of tinned food in the UK is different from how it is in other parts of the world,” says Maximiliano Arrocet, one of the team behind Tincan. In his home country of Spain, for example, “you can get gourmet food in a tin, and it’s not frowned upon”. With the pop-up restaurant, which opened in Soho, London, this week, he aims to “elevate the tin to an object of desire” in the UK. The restaurant’s window displays beautiful cans from around the world; the kind you might buy on holiday as a souvenir and never open. “These are collectible items,” says Arrocet.

Facebook Twitter Pinterest Tincan restaurant. Photograph: Paul Winch-Furness

Every element of the project has been devised by Al_A, an architect’s firm of which he is a director, from the lighting and furniture to the contents of the menu. The idea came after they discovered a tiny restaurant in Lisbon serving only tinned seafood. “We’ve combined two things we’re passionate about: food and design,” he says.

Tincan sells artisan fish that you won’t find in UK supermarkets – the “best tinned fish in the world”, they say. Canned delicacies include Portugese mackerel fillets in olive oil (£7), Icelandic smoked cod livers (£10) and Galician urchin caviar (£18), offered with simple accompaniments – bread, rocket salad, lemon, chilli, shallots, olive oil and parsley.

Facebook Twitter Pinterest A member of staff opens a tin at Tincan. Photograph: Paul Winch-Furness

Having visited some of the small, family businesses that produce these products, the way Arrocet sees it, “the chef is on the other side of the tin. People underestimate how much work goes into them. They select the cuts very carefully and the fish are caught using traditional methods.”

A restaurant dedicated to tinned fish may seem eccentric, but, despite what Arrocet believes, we are not complete strangers to high-end – and beautifully designed – canned products in this country. Ortiz white tuna and anchovy fillets (making Jamie Oliver’s list of store-cupboard essentials), which are sustainably caught and come in yellow ochre cans with an red sailboat on the lid, are available in UK supermarkets for around £4 a tin.

Facebook Twitter Pinterest Ortiz tuna. Photograph: PR

Hugh Fearnley-Whittingstall has been championing tinned fish for years. His favourites are the Pilchard Works from Cornwall, available in Waitrose (£2 a tin) and quite collectible thanks to the traditional local paintings that decorate them, and Fish 4 Ever (“proud to have the smallest boat in the global tuna industry”; under £4 from Ocado), for an artfully designed blue tin. Waitrose’s own-brand speciality sardines also come with lavish, retro illustrations (89p a tin). Cans haven’t had such aesthetic kudos since Andy Warhol’s day.

For 200 years now, canning has been a cheap and efficient way of preserving fish, omega-3 fatty acids and all (tuna is the exception, as it loses its omega-3s in the canning process). Tinned oily fish (salmon, mackerel, tuna, sardines, pilchards, trout) are also one of the few good sources of vitamin D, which aids calcium absorption. And a tin of sardines or pilchards with soft bones will provide around half the calcium adults need in a day (pdf).

No additives are necessary to preserve canned food. You put the food a tin, bung in some sauce, water or oil, seal and heat to kill off the germs inside. “I tell my students that heat is a necessary evil in preserving foods,” says Malcolm Bourne, emeritus professor of food science at Cornell University. “It causes great damage to the colour, flavour and texture.”

Facebook Twitter Pinterest Tinned fish from the Pilchard Works. Photograph: Nick Howell

But some foods fare better than others. “You’ll never find lettuce in a can,” he points out. Tinned meat, mushrooms and most vegetables should only ever be eaten in emergencies, although some fruit and vegetables, canned at their peak, are more nutritious than stored “fresh” produce, despite vitamins B and C loss (and it’s always worth checking for added sugar and salt). Beans, pulses and tomatoes, on the other hand, are kitchen staples.

While canned fish is a different proposition to fresh, its texture suffers much less than that of vegetables. And there is more than one way to tin them, as Nick Howell of the Pilchard Works will tell you. “We use the oldest sardine cannery in the world, in Brittany,” he says. In the industrial process, “the fish goes in the tin raw, they add the sauce, close the tin and then sterilise it a bit longer to cook it. Consequently, it tastes a bit like a boiled sardine.” His fillets, in contrast, are flash-grilled, “then they go in the tin and they’re sterilised for the minimum time – about four minutes”. The result is firmer, with a delicate, fresher flavour.

Good Breton sardines can mature in the tin, he adds. “Some of the top restaurants in Paris have them on their menus; it will be a 1998 tin, or a 1992 tin, like a wine.” Some of us, on the other hand, are content with basic (sustainably sourced) sardines on toast with a squeeze of lemon.

• Tincan is at 7 Upper James Street, London W1F 9DH for the next six months.