To check the temperature of other packaged foods such as liquid eggs, what should be done?

To accurately check the temperature of packaged foods like liquid eggs, it is essential to open the package and insert the thermometer directly into the food. This method provides a true reading of the food's internal temperature, which is critical for ensuring food safety and confirming that the product has been properly stored or cooked.

Inserting the thermometer into the food allows for an accurate assessment, as packaged items can create pockets of heat that don't reflect the actual temperature of the product inside. Using a thermometer provides a reliable measurement, which is vital for preventing foodborne illnesses and ensuring the food is safe to serve.

The other choices do not provide accurate or safe methods for temperature assessment. Checking the temperature on the package or feeling it with your hand does not give a reliable reading. Inserting the thermometer into the packaging can also lead to inaccurate results, as the package itself can insulate the food and prevent an effective temperature measurement.