It doesn't count as one of your five-a-day, but this leek-infused tipple seems to be going down well with patriotic customers.
The Prince of Wales and the Duchess of Cornwall have been marking the national day with a church service and a visit to a music college.
A St David's Day Welsh breakfast was served at the European Parliament in Brussels as the First Minister made a speech in the same city.
In his St. David's Day message, Welsh Secretary David Jones says Wales' two governments must continue to work together so that the country can 'achieve its maximum potential.
As Secretary of State for Wales, I am delighted to deliver my first St David’s Day greeting, and to send my warmest wishes to everyone celebrating our national day at home and around the world.
Devolution means that Wales has two Governments - in Westminster and in Cardiff. Whilst there are certainly political differences between our two administrations, I believe that the First Minister and I are agreed that the interests of the people of Wales are best served by working together as closely as possible.
Over the last few months, I have sharpened the focus of the Wales Office, to ensure that economic growth is at the heart of all we do. Key to growth is the improvement of Wales's infrastructure, which has suffered from under-investment over many decades. Our announcement last year of the electrification of the Great Western rail line to Swansea is a clear indication of our intent to improve Welsh infrastructure. Now we are working on the business case for upgrading the North Wales coast line and are determined to continue the roll-out of superfast broadband throughout Wales.
Every one of us who lives in Wales has, I believe, good reason to feel proud of our uniquely beautiful homeland. It has a rich and illustrious history and, with some hard work from us all, the promise of a better, more prosperous future.
I wish you all a happy St David’s Day. Dydd G?yl Dewi hapus i bawb.
Katherine Jenkins and Gareth Thomas have sent their St David's Day greetings on twitter this morning.
Dydd Gwyl Dewi Hapus! Happy St David's Day everyone!
Happy St. David's day.xx
Pawb Dydd Gwyl Dewi Hapus yn! (he said, trusting Google Translate)
Happy St David's Day to all the Welsh Springer Spaniels on Twitter!
Dydd Dewi Sant Hapus. Happy St David's Day to you all #cymru
Welsh ministers are spreading their St. David's day message internationally today. The First Minister is in Barcelona having hosted a special event in Brussels yesterday. Business Minister Edwina Hart is promoting Wales in Los Angeles while heritage minister Huw Lewis is in China.
They say their international effort is to promote Wales as 'a place to invest, visit and trade with.' Carwyn Jones said:
Wales is a unique place. Everyone who lives here, visits here, studies here, or does business here already knows that. We all know the advantages that Wales offers, but it’s an important part of my job as First Minister to tell the people who don’t know, exactly what they are missing.
We are competing in a crowded international market place. Whether it’s promoting trade and investment, attracting tourism or encouraging overseas students to come and study here, our distinctive qualities and the talent we have here are crucial to selling what we have to offer abroad.
– First Minister, Carwyn Jones AM
We promote Wales because we are committed to do all we can to support our economy and help create jobs here in Wales. We can’t wait for the world to come knocking at our door; we have to get out and show them our wares, and tell them what we have to offer.
I am committed to doing this and so are all Welsh Government Ministers. We will be selling Wales overseas at events organised to coincide with St David’s Day as part of our drive to open new doors for Wales, promote our brand and show a global audience what we have to offer.
Celebrations will be taking place across Wales today to mark St David's day.
Around 600 schoolchildren are expected to take part in Colwyn Bay's annual St David's Day parade starting at 10am in Queen's Road.
Street dancers, schoolchildren and bands will parade thorough Cardiff's streets starting at City Hall at 12.30pm and in Wrexham, festivities kick off at 1.30pm at Lambpit Street. The Rugby League World Cup trophy will also be in Wrexham for the celebrations.
The Prince of Wales and the Duchess of Cornwall will attend the national St David's Day Service at St John the Baptist Church in Cardiff and then visit the Royal Welsh College of Music and Drama.
David Cameron has paid tribute to the people, language and culture of Wales on St. David's Day. The Welsh flag is also to be raised at Downing Street today. In his St. David's day message, the Prime Minister said:
– David Cameron
This St David’s day people throughout Wales and across the world will be celebrating all that it means to be Welsh. From one of Europe’s oldest living languages, a great literary tradition and incredible music, to world-class sport, mouth-watering cuisine and a thriving business environment - we can all take pride in such a rich culture and heritage.
I’m pleased to be flying the Welsh flag over Downing Street today and to wish everyone Dydd Gwyl Dewi Hapus - a very happy St David’s Day.
Pawb Dydd Gwyl Dewi Hapus yn! (he said, trusting Google Translate)
Pontypridd teacher Emma Owen is currently based at international school YCIS Beijing, where she has taught her young pupils some traditional Welsh folk songs just in time for St David's Day.
Over Skype, she told ITV Cymru Wales: "They find Wales fascinating. They are always asking about the language and the castles - we're learning fairytales at the moment, so they're always asking questions!"
Click the video above to watch the pupils singing and dancing to 'Sosban Fach'
A class of Chinese pupils are now fluent in a medley of traditional Welsh folk songs - thanks to their Welsh teacher!
Emma Owen, from Pontypridd, is in her second year of teaching at international school YCIS Beijing.
She has taught her students the words to traditional Welsh songs including 'Sosban Fach' - just in time for St David's Day.
The youngsters put on a special Welsh-themed song and dance performance at their school assembly this morning, complete with face-paint, Welsh flags and a giant daffodil head!
Emma told ITV Cymru Wales: "The kids have worked hard to learn the Welsh words to the songs, which I'm sure is difficult for children who do not speak the language.
"They find Wales fascinating. They are always asking about the language and the castles - we're learning fairytales at the moment, so they're always asking questions!"