This occurs near the beginning of the movie when the Urak-hai and Orcs, who have captured Merry and Pippin, are being pursued by Arogorn, Legolas and Gimli. They stop for the night to build a fire and get a breather. One of the Orcs, after complaining about eating nothing but maggoty bread for days, decides to try to eat Merry and Pippin. After a confrontation with one of the Urak-hai, the Orc's head is chopped off. The Urak-hai then announces; "Looks like meat is back on the menu boys!".
I don't believe that any Urak-hai has ever ordered off of a menu or would even know what one was.