This Is The Best Way To Heat Frozen Food If Your Microwave Is Broken - Tasting Table
Briefly

Microwaves provide convenience in heating frozen food, but if unavailable, a water bath offers a practical alternative. Though it takes longer than microwaving, this method allows for even heating of various frozen items, making it suitable for foods like eggs and oatmeal. The process involves placing a heat-safe container with the frozen food into simmering water, similar to sous vide cooking. Ensure the container is appropriate for heating and avoid overfilling the water to prevent spills. This gentle method not only warms food but is also a great way to thaw it.
Using a water bath is an easy method to heat frozen foods, though it requires more time than a microwave, making it a patient alternative.
To heat frozen foods with a water bath, treat the process like sous vide; place the heat-safe container in simmering water until the food is hot.
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