Longman Dictionary of Contemporary English
The Collaborative International Dictionary
Mince pie \Mince" pie`\ A pie made of mince-meat.
Wiktionary
n. 1 A pie, traditionally served around Christmas time, having a filling of mincemeat (in the sweet sense) and sometimes also containing alcohol or other ingredients. 2 (context Cockney rhyming slang English) eye, ''usually in the plural form''.
WordNet
n. pie containing mincemeat
Wikipedia
A mince pie is a fruit-based mincemeat sweet pie of British origin that is traditionally served during the Christmas season in the English-speaking world. Its ingredients are traceable to the 13th century, when returning European crusaders brought with them Middle Eastern recipes containing meats, fruits and spices.
The early mince pie was known by several names, including mutton pie, shrid pie and Christmas pie. Typically its ingredients were a mixture of minced meat, suet, a range of fruits, and spices such as cinnamon, cloves and nutmeg. Served around Christmas, the savoury Christmas pie (as it became known) was associated with supposed Catholic "idolatry" and during the English Civil War was frowned on by the Puritan authorities. Nevertheless, the tradition of eating Christmas pie in December continued through to the Victorian era, although by then its recipe had become sweeter and its size reduced markedly from the large oblong shape once observed. Today the mince pie remains a popular seasonal treat enjoyed by many across the United Kingdom.