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A Portillo's employee prepares a Chicago-style hot dog during lunchtime.
A Portillo’s employee prepares a Chicago-style hot dog during lunchtime.
Workers hand out pick-up orders during lunchtime at Portillo's River North restaurant.
Workers hand out pick-up orders during lunchtime at Portillo’s River North restaurant.
Megan Lajara, from left, Eric Lajara and their two sons, Jude, 4, and Dylan, 2, foreground, all on vacation from Orlando, Florida, have lunch at Portillo's River North restaurant in Chicago on Oct. 20, 2021.
Megan Lajara, from left, Eric Lajara and their two sons, Jude, 4, and Dylan, 2, foreground, all on vacation from Orlando, Florida, have lunch at Portillo’s River North restaurant in Chicago on Oct. 20, 2021.
Workers get pick-up orders ready at Portillo's River North restaurant in Chicago.
Workers get pick-up orders ready at Portillo’s River North restaurant in Chicago.
Customers in the order line during lunchtime at Portillo's River North restaurant.
Customers in the order line during lunchtime at Portillo’s River North restaurant.
Portillo's River North restaurant in Chicago on Oct. 20, 2021.
Portillo’s River North restaurant in Chicago on Oct. 20, 2021.
A worker prepares a Chicago-style hot dog during lunchtime at Portillo's River North restaurant in Chicago.
A worker prepares a Chicago-style hot dog during lunchtime at Portillo’s River North restaurant in Chicago.
Orders at the pick-up counter at Portillo's River North restaurant in Chicago.
Orders at the pick-up counter at Portillo’s River North restaurant in Chicago.
The Italian beef sandwich at Portillo's on July 9, 2014.
The Italian beef sandwich at Portillo’s on July 9, 2014.
Cathy Weadley, of Chicago, waits for her drive-thru order of a beef sandwich with mozzarella, fries and a coke at a just-opened Portillo's in Chicago's Avondale neighborhood on Nov. 2, 2020. Weadley, holding a souvenir pin she was given, was the first in line, arriving at 7 a.m.
Cathy Weadley, of Chicago, waits for her drive-thru order of a beef sandwich with mozzarella, fries and a coke at a just-opened Portillo’s in Chicago’s Avondale neighborhood on Nov. 2, 2020. Weadley, holding a souvenir pin she was given, was the first in line, arriving at 7 a.m.
Customers in line in front of the menu boards at Portillo's River North restaurant during lunchtime in Chicago on April 27, 2017.
Customers in line in front of the menu boards at Portillo’s River North restaurant during lunchtime in Chicago on April 27, 2017.
Monet Smith, of Chicago, who staffs the hot dog prep station, on Feb. 1, 2017, at Portillo's, which had just opened in Harwood Heights the previous day.
Monet Smith, of Chicago, who staffs the hot dog prep station, on Feb. 1, 2017, at Portillo’s, which had just opened in Harwood Heights the previous day.
Portillo's founder Dick Portillo, who sold the restaurant chain, in the Portillo's restaurant in Downers Grove on May 20, 2015.
Portillo’s founder Dick Portillo, who sold the restaurant chain, in the Portillo’s restaurant in Downers Grove on May 20, 2015.
Keith Kinsey, CEO of Portillo's Hot Dogs, helps in the kitchen during a lunchtime visit to Portillo's restaurant in Homewood on Oct. 28, 2015.
Keith Kinsey, CEO of Portillo’s Hot Dogs, helps in the kitchen during a lunchtime visit to Portillo’s restaurant in Homewood on Oct. 28, 2015.
Robert Gobeli, left, Lukas Soucek, Ella Knight and Chris Castrogiovanni have lunch as the River North Portillo's location reopens for dine-in service on June 26, 2020.
Robert Gobeli, left, Lukas Soucek, Ella Knight and Chris Castrogiovanni have lunch as the River North Portillo’s location reopens for dine-in service on June 26, 2020.
A Portillo's Chicago-style hot dog.
A Portillo’s Chicago-style hot dog.
Moustabha Fane, of DoorDash, arrives to pick up an order at the Portillo's on Taylor Street in Chicago on Nov. 13, 2017, as the restaurant expands its delivery service.
Moustabha Fane, of DoorDash, arrives to pick up an order at the Portillo’s on Taylor Street in Chicago on Nov. 13, 2017, as the restaurant expands its delivery service.
Cathy Weadley, of Chicago, receives her drive-thru order from food runner Isaiah Roman at the newly opened Portillo's in Chicago's Avondale neighborhood on Nov. 2, 2020.
Cathy Weadley, of Chicago, receives her drive-thru order from food runner Isaiah Roman at the newly opened Portillo’s in Chicago’s Avondale neighborhood on Nov. 2, 2020.
A newly opened Portillo's in Chicago's Avondale neighborhood on Nov. 2, 2020.
A newly opened Portillo’s in Chicago’s Avondale neighborhood on Nov. 2, 2020.
Employees take food orders from customers in the drive-thru line at the newly opened Portillo's in Chicago's Avondale neighborhood on Nov. 2, 2020.
Employees take food orders from customers in the drive-thru line at the newly opened Portillo’s in Chicago’s Avondale neighborhood on Nov. 2, 2020.
An Italian beef from Portillo's.
An Italian beef from Portillo’s.
Customers and staff in the Portillo's restaurant in Downers Grove on May 20, 2015.
Customers and staff in the Portillo’s restaurant in Downers Grove on May 20, 2015.
Marciella Sichique makes an Italian beef sandwich at Portillo's River North location on July 9, 2014.
Marciella Sichique makes an Italian beef sandwich at Portillo’s River North location on July 9, 2014.
Inside Portillo's in Chicago's River North location on July 9, 2014.
Inside Portillo’s in Chicago’s River North location on July 9, 2014.
Portillo's popular Chocolate Cake Shake on Feb. 25, 2015.
Portillo’s popular Chocolate Cake Shake on Feb. 25, 2015.
Portillo's River North location at 100 W. Ontario St.
Portillo’s River North location at 100 W. Ontario St.
Portillo's chocolate cake
Portillo’s chocolate cake