I don't quite fall in that category- I'm living where I mostly grew up- but I did live in Holland for two years when I was 14/15 and if you combine the time I spent in Italy over summers it totals to over a year.
Firstly, I miss persimmons. Oh, they have persimmons in Washington, but they're horrible in comparison. A third the size and nowhere near as sweet. I hear California has better ones, but the best I've had were in Europe.
The dinky ones I find here look like this:
The good ones I used to find in Europe that taste 10x sweeter look like this:
Then, I miss french fries. What, you ask? I miss them the Dutch way. MMM, patat oorlog...there was a place near my house that would fresh-cut the potatoes, serve them up on a fancy plate or in a cone, topped with dutch mayo (way better than the crappy american stuff that I'd never DREAM of using as a fry topping), pindasaus (a sweet peanut sauce), and then raw onions sprinkled on top.
How I love the dutch.
Oh man,I'm getting hungry.
And finally, pizza margherita from Italy. Way better than the crap over here. Oh, and there was this place called Romanelli's that was a famous little shop in downtown Brindisi in southern Italy that made the best fried pizza...they had a special recipe that they were famous for.