Looks like some carrots, a hamburg steak (ground beef patty) and a piece of roast beef, like what Arby’s and similar fast food places serves, where the beef just comes in a plastic bag with basting juices and you basically just steam/wet bake it. Not a whole lot of opportunity for maillard browning to happen in a wet cooking environment like that, and when you cook beef hard for a long period of time (a good way to make sure it’s safe to eat), it ends up grey in color.