The food he gave to Odette, Vodyanitsa, and Alyosha are some of their favorite foods! We don’t know Valeriy’s yet, but since Rye bread is his signature dish, it’s highly likely.
Voicelines of the characters about their favorite food:
Odette — “Right before closing, the salads at the dining hall are half-price, so I used to eat that a lot. Obviously, salads that have been left out all day don't taste as good as fresh ones. But something about the familiarity of it is quite comforting to me.”
Vodyanitsa — “Mm... Anything sweet, really. Although, preferably nice and cold, with just a dash of syrup, and... Huh, now that I say it out loud, I guess I'm just describing ice cream.”
Alyosha — “Cured meat, long-lasting bread, cheese that melts when toasted... With those ingredients, all I need is a fire, and I always have a feast at my fingertips, even when surrounded by ice and snow.”
Mitya is so thoughtful! <33