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i dunno anyone who doesn't sear burgers, honestly. as C~T says, it's a function of how big the fire is and how close you are to it. but even 300-400 (last ones i did wer at 400) is still searing, when direct.just treat them like regular brugers. don't poke prod flipflipflip flatten press. turn them only when they are ready to flip (they come free easily), and use a thermiometer, not a clock. can't cook anything to time except a three minute egg.
i thought you WORKED in a prison. sorry man!