My basic take is, you need a food handlers card to serve and prep food. Why can't these portable carts serve liquor (beer / wine) as there is a temporary fence around the area? Food is being served just like a restaurant or bar. Source: http://blog.oregonlive.com/portlandcityhall/2012/05/portland_sues_oregon_liquor_co.html As much as the OLCC is strict in many areas, this is another way of the state getting money for issuing OLCC permits.
uhh they can and they do. The first I know about is across from the Original Pok Pok. There is another one in NE that I can't remember the location of at the moment. Prost on Mississippi will let you bring food cart food onto their biergarten patio. edit: I see now there is some new issue about this. source