Lunch in Menlo Park?
If you're in a seafood mood, Cooks Seafood is very casual, quick, and generally pretty good. Fish & chips dish which are generally made with local or Alaskan halibut are good, as are their crab and shrimp salads. I like their chowders but they are too thick for many people's tastes. I'd stay away from the fried clams, calamari, etc. They tend to overfry these to the degree that much of the seafood flavor is lost. Here's a look at the standard menu, but they generally have 3 or 4 specials every day as well. http://www.jatbar.com/menu.asp?num=435