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This is a common question, with much debate. But what I have found out in my years of cooking is that the best way to reheat things like lasagna or spaghetti is to place it in a frying pan over medium-low heat and just let it sit for about 15 minutes or so. You may want to add some water because the sauce will probably dry up onto the sides of the pan when you first start heating it. Stir occasionally, but not too often, or else you’ll end up breaking up your pasta noodles!
A variation on this method would be to put it in the microwave oven for about 2 minutes at 50% power. That works pretty well too, however, if any liquid separates from your meat sauce during microwaving you will end up with a watery sauce which can be a bit gross. This reheating method also works well for big baked casseroles, like lasagna or macaroni and cheese.
A third way to reheat lasagna, but this is usually only good for people who don’t mind it a bit soggy, would be to pour some water into the bottom of your casserole dish and put it in the microwave at 50% power for about 5 minutes. The liquid will absorb back into the noodles and you’ll have a gooey, yummy dish!