Boris Johnson and his wife Carrie will throw a beach barbecue for world leaders including US President Joe Biden and First Lady Jill (Image: PA)

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Boris Johnson and wife Carrie host a G7 beach barbecue on Saturday – with world leaders expected to toast marshmallows on a fire pit.

In scenes more likely to take place at Glastonbury, a post-A-levels' camping trip or a Scouts' jamboree, the globe's most powerful figures will gather round to eat flame-grilled fare and listen to Cornish sea shanties.

They will scoff a “surf-and-turf” feast of steak and lobster while guzzling Cornish sparkling wine, German riesling, Australian shiraz, Cornish beer and Hedge Row Fizz cocktails.

The unusual and potentially boozy bash, which appears to have been heavily shaped by 33-year-old Mrs Johnson, could be seen as a second wedding celebration for the Prime Minister and his new bride.

Their “boho” reception in the Downing Street garden last month included sitting on hay bales and listening to folk band Bow Fiddlies.

Boris Johnson and Carrie Symonds tied the knot in a secret ceremony in May – followed by a reception at Downing Street

Providing the entertainment for tomorrow evening's sunset party will be Du Hag Owr, who describe themselves as “Cornwall's South Coast Shantymen”.

And in a nod to British traditionalism, the RAF's Aerobatic Team – the Red Arrows – will roar into the sky trailing white, red and blue smoke to pull off a string of spectacular Top Gun stunts.

What's on the menu?

Leaders will enjoy a beach barbecue cooked by chef Simon Stallard from the Hidden Hut in Portscatho.

CANAPES: Sparkling scallops, Curgurrell crab claws and Portscatho mackerel

MAIN: Seared and smokey Moorland sirloin, Newlyn lobster and scorched leeks, served with sides of layered Cornish potato chips, St Just purple sprout broccoli and salt baked beetroot

DESSERT: Beach Hut Sundae

POST-DINNER SNACKS: Baked brie, hot buttered rum and toasted marshmallows around fire pits

DRINKS: Cornish sparkling wine, German riesling, Australian shiraz, Cornish beer and Hedge Row Fizz cocktail