A nice hearty soup. Can basically travel the world because it can feed you and hydrate you when you cannot find water or sustenance. And I think it is healthy enough to not kill you if you survived on it for the last 3 months, might be wrong.

But most importantly it will not take away your pleasure of better food, such as pizza, which after three months only eating pizza, you will be tired of it for the rest of you life

I cannot speak for this area of science, but in my field China’s research papers, for example rock mass failure response to complex stress states, are like a god send, really quality work. This is my opinion in my field but if I had to extrapolate… Remember the Soviets with all their propaganda had amazing scientists