I know this is a super old thread, but I believe it contains some incomplete information.
Portillo’s publishes it’s allergen information online.
https://www.portillos.com/assets/1/6/Portillos-Barnellis_Nutrition_and_Allergen_Template.pdf
The Italian Beef contains “other gluten” & “soy” which leads me to believe there is soy sauce in th...