Ashton Kutcher & Mila Kunis Share 'Flirtatious' Lunch in Chicago
12/27/2012 AT 05:10 PM EST
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