Mr MacElhone’s great-grandson, Franz-Arthur, 33, and the current owner said the Bloody Mary remained the bar’s most popular drink. “We serve around 12,000 of the per year,” he told the Telegraph, adding that the family still had signed copies of Hemingway’s works handed to his grandfather.

Cocktails are not Harry’s only claim to fame. 

The mahogany-panelled bar was long a famously accurate bellwether for American presidential elections thanks to a straw poll conducted a month before the real vote.

Harry’s has missed the mark only three times in nine decades – first when Democrat Jimmy Carter won in 1976; then in 2004, when Republican George W. Bush was re-elected; and most recently in 2016, when it wrongly forecast a landslide victory for Hillary Clinton versus Donald Trump.

That night, punters knocked back the night’s specially concocted cocktails: the Hillaryous and the Trumpet.

However, the time-honored tradition could not forecast Joe Biden’s election last year as the Covid lockdown saw the straw poll called off for the first time since the Second World War.