There are meals that smell so good when you are cooking 'em, meals that take so long to make, that a chef, stuck in close proximity to the cooking dish for most of the day, can't help but get sick of being teased and tortured by it before they can finish cooking it.
The chef becomes completely saturated with the meal's never-ending assault of temptations, wave after wave after wave of flavor and empty promises, hammering against their doors, and wants only to get away from it when they're done.
But two chefs can takes turns preparing the same malevolently delicious chef-withering dish on different nights, and trade the cooking of the dish back and forth, so that they can both enjoy it as an undamaged member of the dinner-table audience, without being subjected to the appetite-destroying standing-in-front-of-a-roaring-blast-furnace-of-intense-sensory-information-all-day preparations that are required to bring the dish to life.
If it wasn't for that trick, we'd have lost a lot of recipes that were too great for a single chef to handle, y'know?
And there might have been some dishes that were too great for even two chefs to handle out there.
Mmm I'm getting hungry.