Since the single-ingredient thing has been so well covered, I'd like to focus more on those simple prepared dishes. Perhaps even simpler than the two mentioned above, since those can actually be quite complicated.
What are those REALLY basic dishes which please you most? For the sake of giving some direction, my definition of "basic" (arbitrarily for the purposes of this thread only) is that the item has MORE THAN ONE ingredient but no more than five, takes no elaborate equipment to prepare, and no more than ten minutes. The ingredients themselves can be staples that are composites of other foods, but if so have to be commercially available in that form.
My two contributions to start off the list are chocolate milk and Peanut butter & Jelly sandwiches.
BTW: if you want a very unusual experience visit a restaurant on Sullivan St in Greenwich Village, NYC called "Peanut Butter & Co." While some will feel mortally offended to pay five or six dollars for a Peanut Butter & Jelly sandwich, its certainly a very very good Peanut Butter & Jelly sandwich.
(Edited by jhlurie at 8:33 pm on Dec. 30, 2001)