Preparing Deer heart is a tricky task. It requires much cleaning prior to cooking. You need to trim the fat from it along with any veins and arteries. You must also make sure that you rinse it completely before cooking. Season the heart simply with salt and pepper to your liking and sautee it in Olive oil on medium high heat until it is cooked through but tender. Some people will like theirs cooked at a medium temperature. A video for preparing deer heart is available at http://www.youtube.com/watch?v=q1HWrDvqDD4.