If Yusei eats Aki's cooking, he might need to get his stomach pumped due to the Mystery Food preparation techniques, and has a disgruntled Jack on his hands.
If Yusei eats Jack's cooking, he might need to get his stomach pumped due to the sheer amount of food prepared by Jack, and he'll have a disgruntled Aki on his hands.
No matter which chef wins, Yusei loses.
. . . I do want Jack's Red Daemon's Apron, though.