Tasty lobster roll
Prime Dip in the TL or on Fillmore has a tasty Lobster Dip. For me, it's rich enough on its own; the accompanying portion cup of "hot melted dill butter" sends it over the top. Not to mention the side dish. I usually split the lobster dip with someone, which makes the price of $14.99 for one sandwich a heck of a deal.
The SF Examiner critic recently did a rundown of SF lobster rolls:
He likes Woodhouse and a place in South SF called New England Lobster Company.
The best of the genre that I've in the Bay Area doesn't use lobster at all: the Louisiana crawfish roll at Pican (in Oakland). You'd have to check to see if they have it on the menu now.