An apple pie is a fruit pie (or tart) in which the principal filling ingredient is apples. It is sometimes served with whipped cream or ice cream on top, or alongside cheddar cheese. Pastry is generally used top-and-bottom, making it a double-crust pie, the upper crust of which may be a circular 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.