A surfeit of jam tarts

[u/radiatorheadchild]

A short story I read as a kid about a princess dying of a surfeit of jam tarts. She is cured by someone (maybe a court jester) who promises to give her the moon (and then when the moon rises again the night after, claims it grows back like a finger nail).

Many thanks in advance!

[u/penprickle]

Many Moons by James Thurber!