| Chicago Tribune The Portillo Restaurant Group traces its start to 1963, when the Chicago-born Portillo began selling hot dogs from “The Dog House,” a small trailer in Villa Park that didn’t have running water or a bathroom. Since then, Portillo’s has grown to 38 … Portillo’s Restaurant Group Announces Investment from Berkshire PartnersThe Herald | HeraldOnline.com (press release) Berkshire Partners nears deal for hot dog chain Portillo’s: SourcesCNBC.com Boston’s Berkshire Partners eyes $1B bid for Portillo’s hot dog chainBoston Business Journal (blog) Comcast SportsNet Chicago all 16 news articles |