The ‘Melt’ Sandwiches include a whole bunch of varieties including what is referred to in several places as the Frisco Melt…Tuna Melt.. Bacon Melt and even Some places refer to the Reuben as the Kosher Melt. I am not sure if the Sourdough Bread makes the link (casual as it is) to that village by the sea north of L A . The dressing is usually a close neighbor to thousand island or perhaps the old HOJO 3D sauce. Some Frisco Melts have grilled onions on the burger, some don’t. Culver’s refers to their sandwich as a Sourdough Melt w/ grilled onions and the cheese melted on the bread as it grills.