1. Heat the oven to 400°F. 2. Unfold 1 pastry sheet on a lightly floured surface. Roll the pastry sheet into a 12x12-inch square. Cut into 36 (2-inch) squares. Prick the pastry squares with a fork.

Cheddar cheese is usually labeled according to its "sharpness." Dr. Michael Tunick, author of "The Science of Cheese," explains the reason for this flavor grading. Here is a transcript of the video.