Kylo never goes to the cafeteria so everyone's just assumed he doesn't eat and subsists through the will of the Force or something like that.

Until Hux goes to the kitchen for a midnight snack one night and accidentally spies on Kylo eating all the leftovers, even licking plates clean, etc. and it's the saddest thing Hux has ever seen.

So Hux starts leaving food (as in complete meals) in the kitchen for Kylo to find and gets a kick out of Kylo confusedly coming across them them and eating them enthusiastically.

Maybe it could escalate to Hux inviting Kylo to dinner?