The National Apple Pie Day is in 2017 on May 13. An apple pie is a fruit pie in which the principal filling ingredient is apples. It is the quintessential American dessert. In countless surveys it has been chosen as the favorite dessert in the United States.
Although apple pies have been eaten since long before the European colonisation of the Americas, "as American as apple pie" is a saying in the United States, meaning "typically American". The dish was also commemorated in the phrase "for Mom and apple pie" - supposedly the stock answer of American soldiers in World War II, whenever journalists asked why they were going to war.
Advertisers exploited the patriotic connection in the 1970s with the commercial jingle "baseball, hot dogs, apple pie and Chevrolet". There are claims that the Apple Marketing Board of New York State used such slogans as "An apple a day keeps the doctor away" and "as American as apple pie!", and thus "was able to successfully 'rehabilitate' the apple as a popular comestible" in the early twentieth century when prohibition outlawed the production of cider.
Apple pie is sometimes served with whipped cream or ice cream on top. Pastry is generally used top-and-bottom, making it a double-crust pie, the upper crust of which may be a disk shaped crust or a pastry lattice woven of strips; exceptions are deep-dish apple pie with a top crust only, and open-face Tarte Tatin. (With material from: Wikipedia)