I am considering taking the Trans-Siberian railway. London to Moscow followed by Moscow to Beijing. I have made many long rail trips in the past so comfort, boredom, etc is not an issue. However, on this route, diet is. I don't expect many, or even any, vegan or vegetarian options on board. So, I need some survival food.
I am not so concerned about the health of the diet. I eat very healthily most of the time. A couple of weeks on a poor diet won't kill me. Anyway, I hope that I will be able to get the occasional piece of fruit. So, what I mainly need is some energy top ups for when I can get no suitable food for an entire day. So, the requirements are:
Energy dense - I don't want to carry too much.
No need for refrigeration.
Can survive rough handling.