Christmas dinner I am planning to cook Roast beef on Christmas day. This is my first time cooking a roast beef. I am preparing for my guests, so I really don't want to fail. I have found some good recipes. One is cooking in an oven and the other is cooking in a pressure cooker. It seems like using a pressure cooker is much easier and much faster. I never knew that I can cook Roast beef using a pressure cooker. Wish me luck.