"While the function doesn't exist on every single model, "keep warm" is one of those largely unknown microwave settings that we should all use more often. This function works by periodically zapping the food at a low power level, giving it just enough heat to keep it from cooling off, but not enough that it cooks further. This incredible function will allow you to keep your food at a perfect serving temperature for 30 to 90 minutes, depending on the model."
"One word of warning, however: Don't forget that the vessel you put your food in is important. Aluminum foil should usually be kept out of the microwave, along with any other metal, be it a roasting tray or a layer of foil meant to seal the top of a dish of green bean casserole. Wood can also be a problem in the microwave, though that issue comes down to the risk of damage to the dishes themselves, rather than the pyrotechnics that come from microwaving metal."
Many meals benefit from holding food warm after cooking, such as early-arriving takeout or staggered courses during large meals. The microwave 'keep warm' function uses periodic low-power bursts to maintain temperature without further cooking. Models vary, but keep-warm can preserve serving temperature for roughly 30 to 90 minutes. The function is not present on every microwave, so manual techniques can achieve similar results. Choose microwave-safe vessels: avoid aluminum foil and other metals, and avoid wood because it can be damaged. Metal can cause sparks, while wood risks dish damage, not pyrotechnics.
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