Sure. Was a fertility/marriage ritual - whoever managed to catch the apple (a long-time symbol of fertility) with his/her teeth would be married within the year.
In earlier times the Druids would force non-pagans to stick their head in a boilng pot of oil and make them pull out an apple in order for them to be spared. Miserable being spared and having a mangled face to live with.
I was a history major with a specialty in British history, and if there was a story like that around I would have read it somewhere.
. . . besides, when the "Druids" were active in Britain, they were supposedly all the religion there was. There WEREN'T any "non-pagans" in Britain, other than the Romans who were just visiting. If a Druid boiled a Roman, it was probably due to wartime animosity rather than religious ritual.
What you may be thinking of is the old fairy tale re the "Cauldron of Youth". That is Welsh in one form, but it appears all over the place in Europe and in Africa as well.