And the equal portions, starting gun, and ready to dive in pose implies that they are having a speed contest, a classic kind of American thing like 1972 onward hot dog eating contest, a race of 10 minutes (they have adjusted the minutes allowed, but time is the key to the race).
I think it's one of the "wife bad" jokes implying the food is bad, they're forcing them to eat to decide which one gets finished faster and is therefore better... I guess? Or maybe some heavily implied sexual joke?