Po'Boys and Pickles is a great little place to stop for lunch if you get a chance.
We stopped by in early July when we first drove into Portland.
Not exactly located in a touristy area, - but have no fear it's worth the effort.
I had the fried oyster Po'Boy with fries and slaw, my wife had their version of a cheeseburger.
Both were very, very good. I loved my fried oysters. But note: they are not served up overly spicy. They have hot sauce on the table that you can use to adjust to a level of heat that you are comfortable with. I'm OK with that. The fries were good too.
Suggest trying their cookies and taking with on the way out - really tasty.