When I used to pull coffees at the 'La Boheme", a bloke used to come in every night, order a lemon tea and he would take out of his pocket, a plastic bag with a spanish onion in it and....wait for it......SUGAR!! He would then sit and eat the onion like an apple and keep on dipping it in the sugar. When I asked him about his unusual habit, he told me that he had been doing it for years and had never had a cold since he started. (I don't think anyone would get close enough to give him one). He swore by it though and said that he used to catch every cold that was going around, but no more.
I remember when we used to go horse riding up at Clent, and when we had finished, we would go into the pub next door and have a pint and a ploughmans lunch. Great big hunks of cheese, crusty bread and as much onion as you wanted. Fantastic. Cant remember the name of the pub though. It wasn't 'The Fountain'.