Tom Kha Gai
Otherwise known as Thai chicken/lemongrass/galanga/coconut soup. It's one of my favorite soups. Nearly every Thai restuarant serves it, and it's always good, but I recently had some as a snack in a new fast-food Thai chain I encountered near Moscone Center in San Francisco called Cha-Am. It was unusual because it was thicker with coconut milk than usual and sweeter--actually, as a snack it was near perfect though it might be a little too heavy (compared with most versions) as the opener to a meal. Still, YUM!