Welcome to another episode of Fast Casual Nation, brought to you by the Foodable Network. This week, we take to the streets of San Francisco to check out the Soma StrEat Food Park. The food truck revolution has really taken off, especially in this locale, where dozens of startups and tech companies, including Twitter and Zynga, are headquartered. Join Paul as he visits some unique food truck concepts, including Seoul on Wheels, Phat Thai, Me So Hungry, and explores the reason behind the movement. Not in SF? Here are six great food trucks in Chicago (a city that's even taken the movement to food bikes) and here are the best healthy trucks in L.A.