salad in Northridge
Do you like Souplantation? If so, there's a location in Porter Ranch, on Rinaldi, between Porter Ranch Drive and Tampa Avenue, right near the 118 freeway exit at Porter Ranch Drive.
I don't know if it has the right ambiance for a date though, as it is a salad bar.
I like the salad bar at Gelson's too-- that's right across from the movie theatre at the Northridge Mall, in the same parking lot as DSW and Jamba Juice. Again, not much of a date ambiance there, but they do have nice patio seating in front of the store.
I personally think Gelson's would be a nicer choice, although it's a little chilly today in Northridge. I prefer to go there when the sun is out and shining brightly.