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Sam turns heads at the Chalerm Buri intersection in Yaowarat but it’s not the spicy salad he sells that grabs the attention of passersby, more that a “farang” is selling Thai street food. The 42-year-old Frenchman explains how he ended up selling “yum woonsen” in Bangkok's Chinatown. Video by Pornchai Sereemongkongpol and Chumporn Sangvilert.