Many home cooks and grill masters cook up their steaks and hamburger patties using the old-fashioned eyeball test. This is when you flip the patty after it turns brown and grill marks start appearing.

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A digital meat thermometer sticks out of a steak on a grill - Dmitry Naumov/Shutterstock Many home cooks and grill masters cook up their steaks and hamburger patties using the old-fashioned eyeball ...