Last night we fired up our new egg and figured we'd cook burgers. Easy, we thought. Did what we were told: Heated unit to 600 degrees, seared burgers on each side for 2.5 minutes, then shut the unit down and left burgers in there for 10 minutes. They seemed to be cooked through, no pink, altho I noticed they didn't seem too hot. Well, my husband and I got pretty severe stomach aches. Not comfortable at all. Was it the burgers? Do they get to the correct internal temp that way? To be fair to the egg, it could have been the tomatos, cheese, or other meal components. Thanks in advance.