factor? gross. i m weary of anything created in a lab. reporter: do you like burgers? i like burgers. but from a cow. not from a reporter: a petri dish. and a nutrition researcher and a food writer served as independent unpaid testers. but there s quite some intense taste. it s close to meat. it s not that juicy. like an animal protein cake. . what the test tube burger doesn t have is fat. fat chance it s going to taste as good. i miss salt and pepper. reporter: they did add bread crumbs, caramel, red beet juice for color and saffron. no lettuce, tomatoes, onions, catch-up. reporters in the audience beg for leftover scraps. can i please have a small bite? reporter: reports varied widely. tastes like meat.