These days, you're lucky to get a Tampon McMuffin or a "burrito" made from toilet water and a ramen packet in prison (a statement we make after watching lots of movies and TV about prison).
One (hilariously haughty) three-star Yelp review for San Quentin proves that it's not five-star dining: "The potatoes had lumps in them and the edges got cold pretty fast, so I felt I had to rush through eating them or they wouldn't stay warm for very long. It didn't OCCUR to them that maybe I wanted to take my time? Why don't they serve them just a LITTLE hotter, then there would be no problem. As for the lumps I guess they were pieces of potato, but still, lumps are weird no matter what."
But this doesn't always seem to have been the case. Inside Scoop SF has resurfaced a menu from Alcatraz, showing what would be served up in the cafeteria from Sept. 2 to 8, 1946.