What is a medium rare hamburger?

Medium rare is a term used to describe a hamburger patty that has been cooked to an internal temperature of 135 to 145 degrees Fahrenheit. This temperature is considered to be safe for consumption by the United States Department of Agriculture (USDA). When cooked to this temperature, the patty will have a juicy and slightly pink center, but will not be completely raw. Medium-rare hamburgers are often considered to be the most flavorful, as the patty has not been cooked to the point of dryness. However, it is important to note that consuming undercooked ground beef can increase the risk of foodborne illness, so it is important to take precautions such as using a meat thermometer to ensure that the patty has reached the proper temperature before consumption.