Foods that change as you eat them
The other day I was munching on some tzatziki with carrots, somewhat mindlessly, while I did some work on my computer and realized after several dips into the bowl that it was getting BETTER! Something about the way the fairly light and subtle flavors built and layered in my mouth just made each subsequent mouthful more and more delicious.
I've noticed this phenomenon with chips, peanuts, popcorn and other salty snacks where it takes a few to get going, but once you get halfway through the bag it's impossible to quit because they're just getting better too! It's like the opposite of eating something rich where you start to feel sick or oversated after just a few bites.
Do any other foods change come to mind that are more or less satisfying as you eat them?
So many things.
Ramen or any soup based noodle. The noodle spend more time in the broth as you eat it. Making the last bite different from the first bite -- both in term favor and in texture.
Bacon -- no explanation is needed.
Any alcohol -- beer, sake, Scotch
So many others.
My uneducated opinion regarding what you are describing is probably the more you eat, the more evenly your tongue gets coated with the salt, or flavor of what you are eating. The tongue has various area's of taste, so if you take a quick bite of something it might not "hit" all the area's of taste on the tongue, thus not giving you full appreciation of the full flavor. The more you eat, the more the contents get spread around the more taste-buds you hit, the better and more intense the flavor is.
I have no idea if I'm correct, but it makes sense to me!