You can reheat roasted turkey by immersing it in a preheated pot of liquid, such as butter or gravy. You can also microwave the roast at a low temperature for about five minutes per pound, flipping occasionally. The key to perfect reheated turkey is to ensure that you don't overcook it and that the turkey reaches an internal temperature of 165 degrees Fahrenheit. Adding water or other liquids will help keep the breast area from becoming dry while maintaining enough heat for hotter parts like the thighs.