It kinda annoys m that we don't even know what WAS the Ultimate Menu content that they've been working on. It was referenced from time to time that so and so food is worthy of the menu, but I suppose they were intending to reveal the grand spread in the big event.
In the food battles it always seemed like they end up going ahead and craft new creations for each contest. Not just pull up something that was already in the menu and refine it.