I'm from a former soviet slav country.
My grandma was born in '37, so during the war they obviously did not have much to eat. During communist rule, when my mum was already born and a teenager, they introduced ration stamps for food and a lot of other things, so you couldn't just go and buy meat in whatever quantities you wanted to. That led to people just having staple dishes that had very little or no meat at all, or used meat very efficiently. Chicken broths and soups made from them were common, and a lot of potato dishes, since potatoes were cheap and plentiful. There was also a lot of dairy stuff, with goverment-backed "milk bars", where you could eat cheaply, but there wasn't any meat in there - they served stuff like creppes and soups and egg burgers. Also, because fresh meat wasn't easy to get, people got creative with stuff, like making "burgers" from mortadella or other cheap cold cuts, breaded and fried. Also, because goverment was communist, everybody should eat the same quality of foods, so "fansy" stuff like olive oil, parmesan etc, was frowned upon(not by regular people) and so you couldn't get them, and everywhere food was just samey, unless you were willing to get something on the side(and pay for it). There was a lot of cabbage, potato and tomato dishes. What people and food factories also did was fake a lot of stuff, because you couldn't get it or there was a shortage of it, like chocolate - so there was a "chocolate-like product", where cocoa fat was just replaced with something else, or abovementioned mortadella, a lot of faking stuff in homemade dishes, making flour from groat, making cheesecake from boiled potatoes, etc. Also, kogel-mogel - raw egg yolks beaten with sugar, every kid loved it.
Pic related, egg burger. It's actually pretty great.