a dish consisting of a sweet or savoury filling covered or encased by pastry and baked in a container
pie in the sky
informal an illusory hope or prospect of future happiness; misplaced optimism
[from the refrain of a 1911 American parody of a Salvation Army hymn: ‘Work and pray, live on hay, You'll get pie in the sky when you die’.][Middle English, perhaps the same word as pie2, the contents of a pie being likened to a collection of objects collected by a magpie]