Just found this relevant story:

Ted Ngoy, "The Doughnut King", is a Cambodian man who moved to Southern California to escape the Khmer Rouge is credited with starting a chain of Cambodian owned doughtnut shops in California. As in the "Ask Chris" segment, Ngoy trained at Winchell's, but it does not seem like Winchell's was actively recruiting Cambodian refugees.

https://story.californiasunday.com/ted-ngoy-california-doughnut-king

http://www.phnompenhpost.com/7days/story-man-they-called-doughnut-king