I love stopping by here for a quick lunch. Their roasted turkey, reubens, and veggie sandwices are all quite tasty. Both of the women who work there are very friendly and make quick work of any sandwich you order. Although the hours are somewhat limiting in that they are really open during the lunch hours (closed on Sundays), Jan's Deli is my favorite deli in Menlo Park. It makes it very easy knowing that it is also right across the street from the Menlo Park Train Station.
Pros: Close to the Train Station, Great Staff, and Quick Service
Cons: Limited Hours