I love food :-).
And yes, it is a difficult question indeed. I had a few meals that stick out, because of the circumstances surrounding them (like in the Restaurant on top of the Space Needle, Seattle; or on my wedding day), though if this is all about the food itself, one of the very best meals I remember were Spaghetti in white wine with sun-dried tomatoes, shrimp and rucola. It’s from a recipe found in Everyday Pasta (p. 200), and it was the first time I made that (plenty of other good recipes in there, btw!).
To this day, I made the same dish about a dozen times at least, but never did I manage to recreate the taste it had that very first time. I suspect it greatly depends on the wine, and unfortunately I don’t have the slightest clue which one I had around that very first time.