I was at the birthplace of Krishna in the middle-of-fucking-nowhere, India, late at night and on a parked bus. A frail old man in a loincloth was pushing a wobbly cart through the potholes in the road and knocked on the window. "Potato," knock knock, "potato" he said pointing at the potatoes sitting next to a skillet on his cart. I tossed him a few rupees and I'll be damned if that wasn't the tastiest potato I've ever eaten.
My favorite in general is the soup in Thailand. Not only did it taste good, but the most Thai I could speak had to do with the type of soup I wanted. A lot of times the cook would be taken aback that I could speak Thai, and try to start a conversation with me.. but all I could do is order soup and beer.
My favorite specifically is this grilled pork found about an hour outside of Bangkok. I used to eat there almost every day and it was the juiciest pork you could imagine, sliced and served with dipping sauce. This stuff was so good, that even after I witnessed the cook drop pieces of the sidewalk and pick them up and put them back on the grill, I could not stop going there (and if I watched him, he would usually drop at least one piece in the course of my eating there).
..and thai sidewalks are fucking nasty