What's a good temperature to cook burgers with?

brainia2

New member
I have a george forman grill and can set the temp from 300-450. What temp should I use if I'm putting a frozen patty on the grill which I saved in the freezer vs one I just made?

Oh and also how so you know for sure when you're burger no longer has raw spots inside? (I'm new to cooking)
 
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