It's pi day so what's a pie?

π is a Welsh invention by William Jones, a farmer's son, from Llanfihangel Tre’r Beirdd. Well, the symbol was anyway. Now one thing Welsh farmers like me like is a good pie, but what is a pie and when is a pie not a pie?

We all agree if it has a pastry case and a pastry topping it's a proper pie. But what about a ceramic dish with a pastry lid, does that qualify as a proper pie? And what about shepherd's pie? No pastry in sight so is it really a pie. As for cream pies, aren't they just flans not pies?
Its pi day so whats a pie?
Its pi day so whats a pie?
Its pi day so whats a pie?
It's pi day so what's a pie?
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