When did Peanut butter become a delicacy?

All of a sudden somethings are a delicacy that have never been considered special before; since moving to Argentina
1.peanut butter
2. ketchup
3. oatmeal cream pies
4. cheez its
5. eggs
-just a few things that I would just DIE to have again:0 notice they are all food; you can see where my priorities are.