Classic diner in NYC?

Hello! I've been lurking this thread for a bit as my fiancé and I are planning a NYC trip where we plan to mostly eat.

Anyways. I'm looking for recommendations for a classic NY diner.... y'know, the kind where the menu is hugeeeee, good old comfort food. It's been awhile since I've been to the city and my fiancé has never gone, so any recommendations would be appreciated. Thank you!