You have a few options when it comes to reheating leftover soup. Lemon Chicken Orzo soup will likely need some additional broth or water added when reheating, since the orzo will soak up some of the liquid.  Microwave: This method works best for reheating single servings of soup. Heat in a microwave-safe dish, covered, for 90 seconds. Stir and microwave for 30 second intervals until hot.  Stove: Return the soup to a pot on the stove and cook over low to medium heat until warmed through.  Crockpot: Use your slow cooker to reheat the soup on low for 1-2 hours.