I was gonna say (fresh) seafood, but then realized what I actually miss is inexpensive variety of everything.
I've been through the list and most every product (can't find kale, really?), with some exceptions, can be found in Argentina, at least in B.A. But in every case it's either too expensive or so understocked, or randomly stocked, that you just can't count on it. And you don't. After a while I guess people become acquainted and desist.
I'll call this failure of the Developed World path.
Since as Steve pointed out Argentines are so intrinsically superior to Mexicans and other Latin Americans, they don't catch up either, resulting in abandoning the Developing World path.
And that's how food makes me realize why I like Argentina as a sort of base. In a time when changes appear to come faster and faster, and everything seems so unpredictable, Argentina is both stuck in time, but maintaining a minimal level of recognizable civilization. It's so unbelievably neutral, as neutral as the blandness of a the food. And that's why I'm still here - from time to time.