Where to get free Fosselman’s soft serve, plus drunken clams at E.P. & L.P.

If you like soft serve ice cream and hot dogs, pay attention. Dog Haus, the sausage-centric franchise known for its King’s Hawaiian roll buns and chili cheese tots, is adding soft serve to the menu. But it’s not just any soft serve; it’s Fosselman’s, from Fosselman’s Ice Cream Company, the San…