Cristina Martínez

E1

Drawing on her family's rich barbacoa tradition, Cristina Martínez has become a Philadelphia food star -- and a voice for undocumented immigrants.

Musa Dağdeviren

E2

At Istanbul's Çiya, "food anthropologist" Musa Dagdeviren meticulously re-creates regional Turkish dishes in a bid to keep them from going extinct.

Bo Songvisava

E3

Frustrated by the dearth of authentic Thai cuisine, Bo Songvisava revives bold, complex local flavors in her sustainable Bangkok restaurant.

Albert Adrià

E4

After years as the creative director of El Bulli, innovator Albert Adrià now presides over an "amusement park" of genre-bending Barcelona eateries.