If they're famine refugees, something like Plumpy'nut[1] maybe. If they're religious refugees, something catering to their religious restrictions. MREs if the refugee operation is being assisted by a military or disaster aid organization. And so forth.
MREs contain a heating packet filled with magnesium pellets and a couple other things, which are used to heat the food when water is added. I'd imagine they don't want those in the cabin, given the gas that is emitted during the heating process.
[1]: https://en.wikipedia.org/wiki/Plumpy%27nut