Guide

Yes, you can grate cheese with a food processor if the cheese is cold, the right disc is fitted, and you pulse or feed it in steady pieces.

No, heating food in styrofoam can melt it and transfer chemicals into food; use glass, ceramic, or microwave-safe paper.

Yes, you can heat food in a plastic container if it’s labeled microwave-safe and isn’t cracked, warped, or disposable.

Yes, you can heat up leftover Chinese food if it was chilled fast and you reheat it until the hottest part hits 165°F (74°C).

Yes—can you heat food in aluminium foil in ovens and on grills, yet foil in a microwave can spark, so the safe answer depends on the appliance.

Yes, you can heat up food twice if it’s cooled fast between heats and reheated to 74°C/165°F all the way through.

Yes, you can heat frozen food in a microwave if you heat it evenly and get the center hot enough to eat safely.

Yes, you can heat food in a toaster oven if you use oven-safe cookware, reheat to a safe temperature, and avoid items that can spill, melt, or burn.

Yes, you can microwave food twice if it was cooled fast, kept at 4°C/40°F or colder, and reheated to 74°C/165°F each time.

Yes, you can microwave food without covering it, but covering helps heat evenly and cuts splatter.