Prepackaged things? It's been a while since I had them as well, or had to cook really...

[And even then, Yuuri seemed to have authority over most of the kitchen related stuff. But eating something other than hard tack and cereals had been wonderful.

Hang on, she's going to grab a pan and set it on the stove top. Probably good to have something to dump the open pack of food in.]

It shouldn't be difficult - it's just got to be heated up, so as long as it's hot it should be fine.