Post-Theatre Dining recommendations?
Book of Mormon (great show, BTW) is closer to 48th and 8th Ave, not Broadway and 46th.
When we saw the matinee last year, we didn't actually get out onto the street until closer to 2 hours and 45 minutes after the start time. So with a short walk, estimate you'll be sitting down to eat around 10pm.
I would look into Ardesia, Kashkaval, or Casellula in Hell's Kitchen, a short walk from 48th and 8th. There's also Totto Ramen and Yakitori Totto.
Most shows are dark on Sunday nights except for four. Restaurants in the neighborhood will close earlier on Sundays as well.
What show are you seeing and what is the running time?
If you really want really excellent, exceptional small plates at 10:15-10:30pm on a Sunday you'll have to walk a bit or go downtown.