This is not my forte. Still, hm. She was originally Diane Roehaven, so a main course of venison would be appropriate. And of course, there must be swans. Sugar swans floating on chocolate!
Beyond that, I don't know. Perhaps ask Micah for recommendations on vegetables, and if she wants radishes carved into swans, sure! Or turnips. And find someone who knows wine to find out what would compliment this.
While I still have some issues with Season 2 (and went into those at length during season 2), thus far, Season 3 is off to a great start.
I love how it makes the city both infinite and intimate -- cities are many cities in one, but because of who knows whom, they all intersect. It's rather like the big gaming convention Gen Con or like a huge WorldCon that way. Heck, it's even like the much smaller Intercon, the larping convention I go to -- 300 people or so, and I know most of them, and some of them I never see the entire weekend because they're doing a different convention than I am because of the games they choose.
Now, we'll see how things develop. I like what I'm seeing of various characters' strengths and of consequences. I want to keep seeing that. People are a mixture of strengths and weaknesses, but I want to believe in the combination I see of the two, and to still care about the characters. I'd like a less dea ex machina than last season.
But for right now, I'm satisfied. Duchess Tremontaine is very much herself, and one of her big weaknesses is that she always assumes everyone sees the world the same way she does and acts for the same reasons she acts. And she still sees the city as hers, and I suspect the city sees her as its own.