Jam roly-poly, spam fritters, chewing gum and sausage meat: These are just some of the taste sensations James Wannerton experiences as he hurtles through the London Underground.
But he's not guzzling his dinner on the train - rather these are the flavours he has come to associate with various stations on the network - thanks to a neurological condition called synaesthesia.
Individuals with synaesthesia (proudly known as synaesthetes), make up at least one per cent of the population, the British Medical Journal writes, describing it as a "fusion of different sensory perceptions."
Not limited to taste, it can manifest in sound and touch too; "The feel of sandpaper might evoke an F sharp, a symphony might be experienced in blues and golds, or the concept of February might be experienced above the right shoulder."
For Wannerton, getting from A to B can be a mouth-watering task, but it's not all tasty travelling for the 54-year-old systems analyst from Blackpool.
Some stations are distinctly unpalatable - Mile End tastes of fingernails while Bethnal Green is saddled with boiled cabbage. (What does your Tube station taste like? HuffPost UK's stop tastes of 'raw carrot')
The "taste map" of the Tube is a labour of love that has taken in numerous trips to the capital over the course of 49 years, the Telegraph revealed.
Wannerton told the newspaper: "It is incredibly consistent. These tastes and textures never change. All I did was traverse the underground lines. It was very natural and involuntary; when the taste popped up I made a note of it."
Wannerton who is the president of the UK Synaesthesia Association, describes his experience of the condition on his website.
"It could, if I let it, take over completely, causing a sort of sensory overload or slowdown. A little like I've been told a proper drug trip is to experience."
Wannerton may have visited every Tube, DLR and overground stop on the network, but the taste tests don't stop there.
He adds: "I live in a house that tastes of mashed potato in a fruit gum town. My next door neighbours are a mix of yoghurt, jelly beans and a subtle hint of a waxy substance."
As with the tube map, real life can taste bad too at times, with Wannerton revealing: "I have a friend whose wife tastes of vomit - I've never told them."
And: "If you are called Virginia, Denise, Donna, Helen or Christine, my brain unfortunately places you at a disadvantage. Sorry. I can't help it."
So there you have it.
The first ever London Underground journey. The station pictured is Edgware road. William Gladstone, who would become prime minister, his wife, and the engineer John Fowler were aboard 24 May 1862
The construction of the Metropolitan Underground Railway - work in progress at Kings Cross 05/05/1861
The original Bank, City and South London underground station near Mansion House 01/08/1901
Women at work in Ealing Common, upholstering railway carriages for the London Underground 01/01/1916
An interior view of one of the carriages of the new Electric Train for the Metropolitan Railway 18/12/1919
Lord Ashfield hands over the silver key to Col. Moore Brabazon during the opening of the new underground railway with the world's longest tunnel which ran from East Finchley to Morden on the Northern line, London. 13/09/1926
Escalators being built at Piccadilly Circus Underground Railway Station 01/09/1928
Unrecognised by passers-by, Britain's Princess Elizabeth, left, and her sister Princess Margaret, are taken for a walk through busy London streets on May 15, 1939, after their first ride on a London Underground train. They were accompanied by their governess and a lady-in-waiting.
Londoners sleep on stopped escalators of a tube station for safety and shelter during heavy bombing by the Germans in London, England during the blitz 01/01/1940
Women knit and talk as they seek shelter in the tube station during heavy bombing by the Germans in London, during the blitz in World War II 01/01/1940
People sleep in Piccadilly Underground station, London, during Nazi bombing raids. 27/09/1940
Londoners sleep on the platform and on the train tracks at Aldwych Underground station,London, during heavy all night Nazi bombing raids 8/10/1940
An air raid warden brings a drink of water for a young girl who has awakened during the night in an air raid shelter at the Aldwych tube station in London, during the blitz in World War II. Hammocks are slung across the train tracks for sleeping. 21/10/1940
British comedian and actor George Formby, centre playing his ukulele, entertains people sheltering from the Nazi bombing raids, in the deep underground station at Aldwych, London 27/11/1940
A bomb which fell during the London Blitz in January 1941 narrowly missed the Bank of England. It crashed through the roadway between the bank, Mansion House and Royal Exchange, shattering the underground subway causing many casualties. 21/01/1941
Secret and concealed war defenses in England dotted the country. Now it safely can be told that an information booth in Trafalgar Square and a greengrocery in Kingston-on-Thames were disguised pillboxes; that an Ilford subway station was an underground munitions plant, and that the Admiralty buildingÂ’s adjunct was a invasion. In this picture, the innocent-looking fruit and greengrocery store in Kingston-on-Thames is really a cleverly camouflaged pillbox in London, England, 11/07/1945
An underground tube train pulls into Cockfosters Station, the end station on the northbound Piccadilly Line 25 Feb 1950
A fire engine attends an underground cables fire in Queen Victoria Street 17 Aug 1950
Locomotive No.23, a Metropolitan 'A' Class engine, built at Manchester in 1866, heads a centenary special at Neasden as part of a grand parade of past and present rolling stock to commemorate the 100th anniversary of London's Underground 23 May 1963
Amar Singh, the Sikh train guard who has now been given permission to wear his turban while on duty on London's Underground, with his wife, Amrid, and their 13-day-old daughter, whom they call Jaki, at their Southall, Middlesex 02 Sep 1964
London transport underground train driver Mr. Earnest Coulson, 60, who has 41 years of service with London transport, takes his hands from the controls of the tube train as it was guided by electronic impulses on the shuttle section of the Woodford-Hainualt line in London, United Kingdom, on Feb. 19, 1968. The train picks up coded impulses from the main track which causes the train to accelerate, coast and brake to a halt at the next station, obeying all instructions given on the way, and slowing down or stopping or restarting as required if there is another train or a speed restriction on part of the route. The train operator, stationed in the front cab, closes the doors and presses the twin Â“startÂ” buttons at the beginning of the run. He can also take over the in the event of failure of the automatic equipment
The Queen arriving at Heathrow Central station in London in the driver's cab of a Tube Train, when she officially opened the £30 million Piccadilly Line extension linking Heathrow Airport with London's underground railway system. Pictured with her is Graeme Bruce, London Transport's Chief Operating Manager 16 Dec 1977
Kingsway in London, England in 1971 with the large sign marking the entrance to the Chancery Lane Underground subway station 01 Jan 1971
Forty-three people were killed after a tube train crashed through buffers and into an end wall. The photograph shows fireman at work in one of the coaches of the six-carriage London Underground train which overran the platform and entered a blind tunnel at Moorgate Station in London 28 Feb 1975
The Queen this morning opened the new Victoria Line. It will be the first time a reigning monarch has ridden on the underground 07 Mar 1969
A London Transport official shows the Prince of Wales the controls in the driver's car of a Jubilee Line train when the Prince took a ride from Green Park to Charing Cross on the new £87 million underground line, which runs from Stanmore to Charing Cross 30 Apr 1979
In 1985, smoking was banned in all stations below ground. It had already been banned on trains the previous year following a fire at Goodge Street station. This however, was not enough to stop people lighting up on the escalators on their way out of atations, a situation which led to the blaze in Kings Cross which killed 31 people.
The top of the fire-damaged escalators at King's Cross underground station in London. The fire, which killed 31 people, is believed to have been started on the main escalator up from the platforms when a lit match was dropped by a passenger 19 Nov 1987
At least 31 people died and scores were injured in a major fire at London's busiest underground station at Kings Cross. Fireman are seen here in the smouldering remains of the main ticket hall in the station. 19 Nov 1987
Transport Secretary Sir George Young standing outside St James Park tube Station in London today. Mr Young confirmed that the Government wants to privatise the London Underground, he is to announce the details in a Commons statement this afternoon 25 Feb 1997
A passer-by stops to look at Floral tributes as London's rush hour ground to a halt tonight (Tuesday) as commuters stopped to pay their respects to the 31 people who were killed in the King's Cross fire disaster 10 years ago. A minute's silence at 7pm across the capital's underground followed a brief service at King's Cross station attended by families of victims of the tragedy, and members of the London Fire Brigade and British Transport Police, and London Underground staff 18 Nov 1997
Commuters travel past London's largest landscape painting along the wall of the Trav-o-lator (moving walkway) at Bank Underground Station in London after it was unveiled earlier today (Monday). The 282 foot, 1.5 million mural, which is American Airlines' latest advertising campaign, depicts a 5,000 mile East to West trip across the USA 26 Jan 1998
English former athlete and politician Sebastian Coe aboard a tube in the London Underground 28 Apr 1998
Protestors sitting on top of an underground train Monday unfurl a banner at London's Bank Station after members of the Reclaim the Street Movement brought trains on the Central Line platform to a halt for 30 minutes 13/07/1998
Covent Garden tube station is closed, as tube trains were cancelled and stations closed because of a strike on London Underground. A 48-hour walk-out by members of the Rail Maritime and Transport Union over job security led to 25 stations being closed. 16/07/02 : Talks aimed at averting a strike which will cause travel chaos for millions of passengers were being held with time running out for a breakthrough in a row over safety. Workers on London Underground are due to walk out for 24 hours from 8pm on Wednesday, which will cripple Tube services throughout Thursday. Leaders of the Rail Maritime and Transport union were meeting LU officials today in an 11th hour bid to avert the strike.
Transport Minister John Reid and Deputy Prime Minister John Prescott (R) travel on a tube train to open the first phase of London Underground Jubilee Line extension. Prescott took the 7-minute trip south from Stratford in East London to the Dome at Greenwich
Britain's Prime Minister Tony Blair travels on the newly built Jubilee Line extension on the London Underground, en route to the Millennium Dome in Greenwich 21 Dec 1999:
A woman traveller rides on an escalator in the renovated Westminster Underground station designed by Michael Hopkins & Partners architects, part of the London Underground Jubilee line extension 26 Jan 2000
Lifelike models of actor Sean Connery and singer Kylie Minogue, on the platform of Baker Street London Underground station. *Research conducted by Madame Tussaud's reveals that visitors to London put the tube in the top three attractions in their visit to London. According to the results London's history, shopping and underground network are the highlights whereas the weather, food and prices are the low points. 16 Mar 2000
A lifelike model of presenter Chris Evans is admired by a young boy, on the platform of Baker Street London Underground station. Research conducted by Madame Tussaud's reveals that visitors to London put the tube in the top three attractions in their visit to London. According to the results London's history, shopping and underground network are the highlights whereas the weather, food and prices are the low points 16 Mar 2000
Police evacuate Westminster Underground Station in London after bomb disposal experts performed a controlled explosion on a suspect device found on a London tube line near Ealing station. * The security alert brought chaos to tens of thousands of rail travellers as commuter trains and services to and from the west of England, South Wales and the Heathrow Express which also travel through Ealing Broadway were hit 19 Jul 2000
The London Underground train which was hit by a falling tree as it was travelling between Osterley and Boston Manor near Hounslow, south west London, after a night of hurricane winds and torrential rain 30 Oct 2000
The scene outside White City Underground Station near the BBC Television Centre in Wood Lane, London, following an explosion which destroyed a taxi in the early hours of 04/03/01. Coded warnings were received by the police and bomb disposal teams attempted to carry out a controlled explosion when the bomb went off.
The emergency services arrive on the scene at Chancery Lane Underground Station in London after a tube train hit a tunnel wall 25 Jan 2003
Justin Manser performs on the first day of licensed busking on the London Underground at Canary Wharf station, the first of 12 stations to host legal buskers across a total of 25 pitches from Dockalnds to the West End 19 May 2003
The Oyster car pre-payment system was introduced in July 2003
A train on the DLR (Docklands Light Railway), in London 9 Apr 2004
Sebastian Coe, chairman of the London 2012 Olympic bid, unveils a giant banner at the BT centre 14 Feb 2005
14 dancers from the UK's Rambert Dance Company perform extracts from their 'Constant Speed' production on an escalator 17 Jan 2005
Prime Minister Tony Blair (left) and Deputy John Prescott visit St. James's Underground Station in London to attend a meeting to signify their support for the tube Improvements 22 Jul 1999
Escalators at Canning Town tube station, designed by architects Troughton McAslan, now open as part of the London Underground Jubilee line extension 11 Nov 1999