Rare hamburger cannot be served ________.

Serving a rare hamburger on a children's menu is not advisable primarily due to food safety concerns. Children are at a higher risk for foodborne illnesses, and ground beef cooked to rare doneness may harbor pathogens such as E. coli or Salmonella, which are more effectively killed by thoroughly cooking the meat to the appropriate internal temperature.

To protect children, food safety regulations and best practices recommend serving only well-cooked hamburgers that are cooked to a minimum internal temperature of 160°F, which significantly reduces the risk of foodborne illness. Thus, placing a rare hamburger on a children’s menu poses an unnecessary health risk, aligning with food safety standards that prioritize the well-being of vulnerable groups.

While there may be various contexts in which rare hamburgers can be served, such as during special events or if they have been properly frozen prior to cooking, these scenarios do not negate the increased risk associated with serving undercooked beef to children.