Here’s a handy temperature guide for the doneness of grilled burgers.
|Burger Doneness||Internal Temp|
|Well Done||> 160*F|
If you must grill burgers well done, make a panade by mashing together 1/2 cup cubed white sandwich bread and 2 Tablespoons milk. Mix the panade with 1-1/2 pounds of ground beef and combine thoroughly before forming patties. The panade will keep the burgers moist even when cooked to well done.
Measure internal temperature in the center of the burger using a good quality instant-read thermometer like the ThermoWorks Thermapen.