Prepared by Pamela Schmutz, HGIC Food Safety Specialist, and Elizabeth Hoyle, Extension Food Safety Specialist, Clemson University. (New 05/99. Revised 06/11.)
Thawing: Thaw uncooked meat in the refrigerator or in cold water. NEVER thaw meat at room temperature.
Marinating: Marinate food in the refrigerator, not on the counter. Discard the marinade after use because it contains raw juices, which may harbor bacteria. If you want to use the marinade as a dip or sauce, reserve a portion before adding raw food.
Partial Cooking or Browning: Never brown or partially cook meat, then refrigerate and finish cooking later, because any bacteria present would not have been destroyed. It is safe to partially precook or microwave meat IMMEDIATELY before transferring it to a hot grill or oven to finish cooking.
Cooking: Use a food thermometer EVERY time you cook raw foods; reheat leftovers; and hold hot, cooked foods for serving.
Serving: Hold hot foods above 140 °F and cold foods below 40 °F. Never leave foods, raw or cooked, at room temperature longer than two hours. On a hot day with temperatures at 90 °F or warmer, this decreases to one hour.
Leftovers: Always use clean utensils and storage containers for safe storage. Divide large amounts of leftovers into small, shallow containers for quick cooling in the refrigerator. Don’t put large pots of gravy or stew in the refrigerator to cool since it will likely take until the next day for this amount of food to cool. To store in the refrigerator, wrap cooked meat in plastic wrap or aluminum foil, or store it in a tightly covered container. It is best to use refrigerated leftovers within four days. If you may have kept the food refrigerated for too long, throw it out. Never taste food that looks or smells strange to see if you can still use it. For frozen storage, wrap meat in heavy duty aluminum foil or freezer paper, and for best quality, use within two to three months.
One of the critical factors in controlling bacteria in food is controlling temperature. Bacteria grow very slowly at low temperatures, multiply rapidly in mid-range temperatures, and are killed at high temperatures. For safety, food must be cooked thoroughly. Always use a thermometer when cooking meat to take the guesswork out of cooking and to assure that a safe temperature has been reached to destroy harmful bacteria such as Salmonella and E.coli O157:H7. Using a thermometer is the only reliable way to ensure safety and to determine the "doneness" of most foods. To be safe, a product must be cooked to an internal temperature high enough to destroy any harmful bacteria that may have been in the food. A thermometer should also be used to ensure that cooked foods are held at a safe temperature (below 40 °F or above 140 °F) until served.
Recent research has shown that color and texture changes are not reliable indicators that all bacteria have been destroyed. For example, ground beef may turn brown before it has reached a temperature that will destroy bacteria. A consumer preparing hamburger patties and depending on color changes in the meat to determine safety is taking a chance that pathogenic microorganisms may survive. A hamburger patty cooked to 155 °F, regardless of color, is safe.
The temperature at which different pathogenic bacteria are destroyed varies, as does the "doneness" temperature for different meat and poultry products. A roast or steak that has never been pierced in any way during slaughter, processing or preparation and has reached an internal temperature of 145 °F is safe to eat. A consumer depending on color as a sign of doneness, might continue cooking it until it was overcooked and dry. A consumer using a thermometer can be assured that the food has reached a safe temperature.
A Food Thermometer Can Help:
There are several types of food thermometers available at grocery, hardware or kitchen supply stores. The type of thermometer determines when it should be inserted in the meat. Make sure the thermometer you buy is designed for meat and poultry, not for candy or appliances.
Regular, Ovenproof Types: These go into the food at the beginning of the cooking time and can be read easily.
Instant-Read & Digital Types: These are not intended to go in the food in the oven, but give you a quick reading when inserted into the cooked food, and can be read easily.
Pop-Up Types: These are commonly found in poultry, but may be purchased for other meats.
Microwave-Safe Types: These are especially designed only for microwave ovens.
When should the thermometer be inserted - at the beginning of the cooking time or the end? When you insert the thermometer will be determined by the type, ovenproof or instant-read. The important thing is to use a food thermometer, no matter how the food is prepared - roasted, broiled, fried.
Before using a food thermometer, read the manufacturer's instructions. The instructions should tell how far the thermometer must be inserted in a food to give an accurate reading. Most thermometers also come with instructions on how to recalibrate the thermometer. (See below for more information about calibrating a thermometer.)
If instructions are not available, check the stem of the thermometer for an indention, or "dimple" that shows how deep it must penetrate the meat to get an accurate reading. Most digital thermometers will read the temperature in a small area of the tip. Dial types must penetrate 2 to 3 inches into the food. Most thermometers available will give an accurate reading within 2 to 4 °F, if the thermometer is placed in the proper location in the product. If inserted incorrectly, or if the thermometer is placed in the wrong area, the reading will not accurately reflect the internal temperature of the product.
In general, the thermometer should be placed in the thickest part of the food away from bone, fat or gristle. For whole poultry, insert in the inner thigh. When the food being cooked is irregularly shaped, such as may be the case with a beef roast, check the temperature in several places.
Tips for Thermometer Use:
Most pathogenic bacteria are destroyed between 140 °F and 160 °F, but the recommendations for "doneness " varies for the type of meat or poultry. See the table below for minimum recommended internal temperatures.
Ground meats must be cooked thoroughly to kill harmful bacteria. Unlike whole meat, which is sterile inside, grinding exposes the interior meat to bacteria on the surface, in the air, on equipment or on people's hands. To kill these bacteria, food safety experts have one major rule of thumb, which is to cook ground meat to at least 155 °F. This simple step offers the best protection that consumers can have to serve ground products safely.
These temperatures ensure that foodborne bacteria have been destroyed. For reasons of personal taste or texture preferences, consumers may choose to cook meat and poultry to higher temperatures.
|145 °F||Fish steaks or fillets. All cuts of beef, lamb, pork and veal. For both safety and quality, allow meat to rest for 4 minutes before carving or eating.|
|155 °F||Ground, mechanically tenderized or injected meats. Ground fish. Egg dishes.|
|165 °F||Poultry and wild game. Stuffing and casseroles.|
A food thermometer can be checked for accuracy using either the ice water method or the boiling water method. The ice water method is explained below. Many food thermometers have a calibration nut under the dial that can be adjusted. Check the package for instructions.
Even if the food thermometer cannot be calibrated, it should still be checked for accuracy. Any inaccuracies can be taken into consideration when using a food thermometer, or it can be replaced. For example, ground beef patties must reach 155 °F. If the thermometer is reading two degrees too high, two degrees would be added to the desired temperature, meaning hamburger patties must be cooked to 157 °F.
Ice Water Method: To use the ice water method, fill a large glass with finely crushed ice. Add clean, cold tap water to the top of the ice and stir well. Immerse the food thermometer stem a minimum of 2 inches into the mixture, touching neither the sides nor the bottom of the glass. Wait a minimum of 30 seconds before adjusting. (For ease in handling, the stem of the food thermometer can be placed through the clip section of the stem sheath and, holding the sheath horizontally, lowered into the water.) Without removing the stem from the ice, hold the adjusting nut under the head of the thermometer with a suitable tool and turn the head so the pointer reads 32 °F.
Microwave ovens can cook unevenly and leave "cold spots" where harmful bacteria can survive. For this reason, it is important to use the following safe microwaving tips to prevent foodborne illness when cooking or reheating meat.
For more information, request HGIC 3500, Basics of Safe Food Handling, HGIC 3587, Food Thermometers: A Key to Food Safety, and HGIC 3586, Microwave Food Safety.
Page maintained by: Home & Garden Information Center
This information is supplied with the understanding that no discrimination is intended and no endorsement by the Clemson University Cooperative Extension Service is implied. All recommendations are for South Carolina conditions and may not apply to other areas. Use pesticides only according to the directions on the label. All recommendations for pesticide use are for South Carolina only and were legal at the time of publication, but the status of registration and use patterns are subject to change by action of state and federal regulatory agencies. Follow all directions, precautions and restrictions that are listed.