When making pie dough, it's very important to use really cold butter. This will ensure that the crust is rich, flaky, and buttery. Most recipes remind you that the butter should be cold, but whenever I'm baking a pie, the first thing I do, before measuring anything, is cut the butter into 1/4-inch cubes. I put the cubes in a small dish and place it in the freezer. Then, I start making the dough. The butter is in the freezer for only a few minutes and doesn't really freeze; instead it gets really cold. Do you have a tip for great Thanksgiving pie?