While they obviously have similar menus, each meal, ship, and itinerary is going to be different. Often they'll cater the menu to the area being cruised or based on the majority of nationalities on the cruise.
What specifically are you wondering about? I'm sure there's enough Princess cruisers on here they will be happy to answer any questions you might have.
But if you want to just look at a sample menu, I agree with trackypup in that you can just google it to see what you can find.
45 Cruises & Counting! Favorites: Paul Gauguin to Tahiti: Uniworld River Cruises in Europe; any of the Celebrity Solstice-class ships; Holland America for 12-nights in the Baltics & Russia; RCCL for 14-night Greek Isles, Turkey, & Croatia; Holland America for 14-day Alaska cruisetour; 10-night Canada/New England cruise; 21 days in Hawaii including a 7-night NCL cruise; Oceania for 25 days in Asia; & 3 months touring Europe by train. And many days spent in all-inclusive resorts!