(for instance, here burritos are rare [and chimichangas rare^2], but for almost all the instances one would have eaten a burrito in the Old Country, here a döner serves)
Time to watch a few movies with restaurant scenes to see what the students eat, I guess.
* what cheap food people made instead of pizza? I think in Lithuania it is anything with meat and potato. In some occasions meat and dough (kibin might be more interesting case). My mother did pizza actually but it is not pizza in traditional sense as it was done with carrots and green peas.
* what cheap street food was eaten instead of pizza. I don’t have idea here as I don’t remember street food at all. I remember we bought kvass in the street.
It's alluded to in the answers, but Khachapuri comes closest imho
(Come to think of it, what about street food? I know kvass wagons were popular in summer, and there's a great drink machine scene in « Наваждение », but [apart from bologna(?) sandwiches at 90s discos] I'm blanking on food — maybe I should check train station scenes for aunties?)
[No luck at the club scene in Courier (1986); IIUC the club only serves drinks and desserts like vermicelles? https://www.youtube.com/watch?v=jvdlAgreRug&t=2585s (EDIT4: no, not marroni, Мороженое. My bad)]
EDIT: I think I need to move my YT bubble back over to runet; atm it's refusing to give me the original clip for Желтые тюльпаны (which I recall had various slice-of-life scenes: going to the bank, making a phone call, etc.) and insists on delivering only the Pesnya-90 performance.
EDIT2: there's a tablecloth-covered table in the background at https://www.youtube.com/watch?v=8eXc8A6MbYY&t=252s so in principle (when the kitchen is open?) that cabaret serves food, but unfortunately nothing else in the clip indicates that 1991 russians survived on more than tobacco and alcohol...
EDIT3: think I found the kind of food that the previous establishment would've served: see the table at https://www.youtube.com/watch?v=mI8T1h0ohcQ&t=29s ... but in this case the bread and meats are served separately; no clue as to any cheese. Note the Pepsi-Cola! (also: some kind of street food at 1:30?)
It turns out the oh-so-slavic фастфуд is a productive key word, which along with в СССР turns up all sorts of stuff, eg https://dzen.ru/a/ZMUdmvvciD8Z75RH , http://lozhka-povarezhka.ru/vsyo-o-ede/5-ulichnyh-fastfudov-... , and even https://www.youtube.com/watch?v=N9W5NJddmfM (25 min worth?)
[and TIL those roosters were lollipops; what d'y'know... One of these days maybe I'll learn what one could buy with the 3 kopeck coins?]
>http://lozhka-povarezhka.ru/vsyo-o-ede/5-ulichnyh-fastfudov-...
The algorithm there flashed me a macD clip of the Gorbachevian and it hit me like a flag pole why Pepsi was emblematic of the Yeltsinian.
EDIT: > https://youtu.be/N1jhynHVMSw
The street fishmonger at 3:20 explains Gazmanov's « ... тебя как рыбу к пиву подают. »
Lagniappe: https://www.youtube.com/watch?v=a-CnWwbeetE
EDIT: I see Pugacheva has vocal credits for "The Irony of Fate"; that means the Pugachevous period spans from the Brezhnevian through the Putinian epochs...
An old Soviet joke said future encyclopedias will define Brezhnev as "a minor politician active during the Alla Pugacheva epoch".
Did anyone ever take ABP up on her suggestion they should brand her as a foreign agent?
(Но что такое рыцарь без любви / И что такое рыцарь без удачи?)
Пора пора порадуемся на своем веку
Красавице и кубку счастливому клинку