eli5: How do “instant” versions of foods (instant oatmeal, coffee, rice, etc.) exist? Why are they not the standard since they’re so efficient?

Question

eli5: How do “instant” versions of foods (instant oatmeal, coffee, rice, etc.) exist? Why are they not the standard since they’re so efficient?

In: 11

Answer 1

Are you also talking about freeze-dried food?