Ashton Kutcher and Mila Kunis
12/27/2012 at 03:00 PM EST
After spending some quality time in Iowa
over the holidays, Ashton Kutcher
and Mila Kunis
visited Chicago on Thursday.
Around noon, the couple stopped into eco-friendly restaurant Prasino
"They were both very courteous to the staff and flirtatious with each other," an onlooker tells PEOPLE.
At the restaurant celebrated for its farm-to-table cuisine, the former That 70s Show
costars shared dishes including the short rib skillet and Florentine crepes.
– Jennifer Garcia