An apple pie is a fruit pie in which the principal filling ingredient is apples. Apple pie is often served with whipped cream, ice cream, custard or cheddar cheese. It is generally double-crusted, with pastry both above and below the filling; the upper crust may be solid or latticed. The bottom crust may be baked separately ("blind") to prevent it from getting soggy. Deep-dish apple pie often has a top crust only. Tarte Tatin is baked with the crust on top, but served with it on the bottom.