Legumes.
Also, while the use of spices/herbs in general is probably universal -- unless you count country club food -- I think the only individual spice that is universal is salt. But that doesn't really count, to me.
I think the safest answers are:
Rice/lentils/beans
Eggs
Wheat in some form, be it bread, noodles, etc.
One could include "animals" which, at least before the rise of modern religions that promote vegetarianism, and vegetarianism for other reasons in this century, was almost certainly universal.
Certainly 200,000 years ago they were, no?.