The royal couple shared the recipe, which features spinach, broad beans and tarragon, on the Royal Family's official Twitter account.

A palace chef, dressed in a white uniform, embroidered with the late Queen's EIIR cypher, and a chef's hat, was shown making the quiche in a video posted on social media.

The Royal Family's website described it as "a deep quiche with a crisp, light pastry case and delicate flavours of spinach, broad beans and fresh tarragon".

"Eat hot or cold with a green salad and boiled new potatoes - perfect for a Coronation Big Lunch!"

The recipe is by royal head chef Mark Flanagan and was chosen by the King and Queen Consort in collaboration with him.

Former Buckingham Palace chef Darren McGrady said the King's choice came as no surprise because Charles "loves anything with eggs and cheese".

Mr McGrady, who worked for the late Queen for 15 years, said he had made quiche for Charles many times.

"It's no surprise that King Charles III has shared Coronation quiche to celebrate his Coronation," he tweeted.

"His mother, The Queen loved chocolate, but The King loves anything with eggs and cheese.

"Made this for him many times... especially with salmon he'd caught in the River Dee."

Buckingham Palace said the quiche was chosen because it worked as a sharing dish, can be served hot or cold, suits a wide variety of dietary requirements and can be easily adapted to suit different tastes.

The palace also said it tasted delicious and had the benefit of not being too complicated and not requiring costly or hard-to-source ingredients.

Quiche is known as a French classic, but is said to have actually originated in Germany in the Middle Ages with the word quiche coming from the German word for cake: "kuchen".

Great British Bake Off contestants have made quiches in the past as part of 1980s-themed challenges.

Even cookery queen Delia Smith has struggled with soggy-bottomed quiches and her website contains advice on how to avoid the problem.

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Smith wrote for a recipe for Quiche Lorraine: "For years I've been experimenting with this type of recipe to eliminate, forever, the problem of the soggy pastry base that seems to plague so many people, myself included.

"I will stress that the container must be metal, not porcelain or glass."

The Coronation Big Lunch aims to bring neighbours and communities together to celebrate the coronation on 6 May.

The Queen Consort has been patron of the Big Lunch initiative since 2013.