"... and a partridge in a salad"

We'll be celebrating the birthday of my sister INGER in fine style this weekend, with a dinner at CORRIGAN'S MAYFAIR, a celebrated restaurant located about 2 1/2 blocks west of the American Embassy on Upper Grosvenor Street, LONDON.
We'll be celebrating, but I am not sure what exactly I'll be eating.
Inger forwarded me a menu, and I have never heard of half the items.
"Steamed brill?" (Turns out it's a flat fish.)
"Grilled langoustines?" (Some people call them " Norway lobsters.")
"Marinated ceps?" (Unfancy name: "Mushroom salad.")
The menu items I can identify make me blink in a "did-I-read-that-right?" style.
"Oxtail ravioli?"
"Grouse pie for two?"
"Braised pork cheeks?"
"Salad of partridge?"
"Saddle of wild rabbit?"
As I read the menu, I began to feel:
1) Like the simple country folk I probably am.
2) A bit crestfallen. What is there to eat here?
Then I read:
"Roast cod, Jerusalem artichokes, red wine --" ahh... "-- and bone marrow." Errr...
Perhaps I should just skip right to the dessert menu and the black figs and port with mulled wine sorbet.