Final answer:
A bimetallic stemmed thermometer should be placed in the thickest part of the food, avoiding bone, fat, and gristle, and inserted at least 2 inches deep or from the side into thinner foods to accurately measure the internal temperature.
Step-by-step explanation:
When using a bimetallic stemmed thermometer, it should be inserted into the thickest part of the food to ensure an accurate measurement of the internal temperature. The sensor, located at the stem's tip, should not touch bone, fat, or gristle as these can provide an inaccurate reading. It's important to insert the thermometer at least 2 inches into the food, or if the food is thinner than 2 inches, then from the side to ensure it reaches the very center of the product.
To measure the temperature effectively, make sure that the thermometer is not exposed to the air or the cooking container as external temperatures could skew the reading. This will confirm that the food has reached a high enough temperature to kill any potential bacteria, ensuring the safety and healthiness of the consumed product.