Burger internal temperature

160°F

Cook ground beef (burger) to a safe minimum internal temperature of 160 degrees F, checked with a food thermometer.

USDA states safe minimum internal temperatures, not doneness styles, and ground beef is its own category with a higher safe minimum than whole-cut steak.
Grounded in: foodsafety.gov, fsis.usda.gov. The number above appears verbatim in the linked government sources.
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