... is a type of upside–down apple tart, named after the hotel in Lamotte–Beuvron (a small town in central France) where it was created accidentally in the 1880s by one of the proprietors, Stéphanie Tatin. This being the case, 'Tatin' should have a capital T.
According to Wikipedia, the fruit in a tarte Tatin is "usually apples" – implying that it doesn't have to be.
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