At some point I remember hearing of a kind of block of chocolate that
was sold in Spain when chocolate was first introduced there, called
something like a 'piece of the Americas' or a 'taste of the Americas'.
 This was a block of chocolate that had in it bits of foods that came
from the Americas, like (possibly) tomato, potato, etc, and traded on
the exotic nature of the new foods.  Now I am looking for a recipe for
this, or barring a recipe at least some information that would provide
a lead--like a name, date range, etc.  I have been unable to find
anything out about this, perhaps partly because I do not know what it
was called.

Hi Mark,

That sounds like a later urban legend.  These sites all say that cocao
was only drunk until the mid 1600s, the first solid chocolate to eat
in 1674.  By then it was a sweet, and it seems unlikely that anyone
would have messed it up with bits of potatoes and tomatoes.  But maybe
someone once recently marketed something like you describe  - with
such a modern sounding name.

http://www.fieldmuseum.org/Chocolate/history.html
http://www.chocolat.ch/chocsuissages.htm
http://inventors.about.com/library/inventors/blchocolate.htm
http://library.thinkquest.org/J0110012/history/history_of_chocolate1.htm

Regards, Myoarin