The Best Way To Reheat Frozen Rice Is Also The Quickest - Tasting Table
Briefly

Frozen rice can be reheated quickly and fluffily in the microwave, using a covered bowl to trap moisture and steam the rice for optimal results.
Using a rolling pin inside a freezer bag is an easy way to break up clumps of frozen rice before microwaving, ensuring even heating and texture.
The microwave is not only the quickest way to reheat frozen rice, but it also helps retain moisture, creating fluffy results in under 5 minutes.
For the best reheating results, avoid thawing rice in the fridge or stovetop, as this may lead to drying or burning the rice.
Read at Tasting Table
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