[Someone]

One of Apple’s early LaserWriters had an Easter egg in ROM that faxed in an order for a burrito at a restaurant in (or near) Cupertino.

Details aren’t on the web, AFAIK. https://news.ycombinator.com/item?id=13440422 mentions it was to print, but I think https://en.everybodywiki.com/Stump_the_Experts#Sample_Questi... is right that it faxed an order (that’s why the question included “fully equipped”; the fax part was optional)