Inexpensive, tasty, with a menu that both carnivore tourists and vegetarians will find satisfactory and varied enough to try. "Pod Temidą" Milk Bar is also something worthy from a visitor's point of view - it symbolises the non-capitalist approach to running eateries. Nothing is overpriced there, exactly as its commie originators intended it.
See the menu: http://www.bar-mleczny.com.pl/english/jadlospis-en.php before you go and pick your meal. Join the queue, place our order, pay and wait!