Indeed. It was widespread by the "cooperative" movement and the first fast food was shashlyki (even before the fall) and khachapuri. South Caucasus people were the first who started with food and flower markets. So the cuisine.

Makes sense; many take-away pizzerias here also sell the turkish variant (pide) of khachapuri.

(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's definitely as delicious as pizza, mmm...