Samgye-tang

Back when I lived in Hong Kong, I would usually go home to LA for Christmas and always be run down, fighting a cold, etc. But if I took the Korean Air flight that changed in Seoul, on the advice of Korean friends I made sure to down a huge bowl of Samgye-tang at the Incheon airport. By the time I landed in LA, I'd be fine. Ever since, it's my first line of "oh man I'm feeling a cold coming on" defense and is super helpful.