commonsense-
I don’t have a restaurant recommendation (sorry!), but here are a few suggestions/ideas:
-Owners and employees of kosher restaurants read these threads. So…
1) How many people (approximately) do you have in mind?
2) Does “Brooklyn” include Williamsburg, Crown Heights, etc. – i.e. all of Brooklyn, or only the Flatbush / Boro Park area?
3) What price range do you have in mind (approximately – it’ll vary based on service, course choice, desserts and other factors).
4) What other requirements do you have (private room, mechitza, etc).
Good luck.
Oh, and Mazel tov!