The best way to serve a pint of Guinness has divided drinkers for eons.
It's notoriously difficult to get right, but the right way to serve black stuff comes down to the right angle, patience, and perfect doming.
As the St Patrick's Day celebrations begin, we visited bar manager Andy at The Guinea in London's Mayfair – where they sold 2,000 pints of Guinness on March 17 last year – who told us the secrets to a good drink and the history of the widely celebrated cultural holiday.