 And this weekend, lots of grills will be fired up. And unfortunately, a lot of people are going to be getting sick because of some grilling mistakes. Agriculture Department food safety expert Meredith Carruthers is with us to give us the two biggest mistakes outdoor grillers make. Top of the list. Not fully cooking the foods on the grill. That happens a lot because for one thing. Grilling really makes it look done a lot of times way before it actually is fully done.