'An authentic San Francisco experience': Sam's burger joint to gain legacy status FacebookTwitterEmail 1of6 Barry Duong and Richard Aspillera wait for their food outside Sam’s Burgers in San Francisco.Nick Otto/Special to The ChronicleShow MoreShow Less 2of6 Second-generation owner Emad Elshawa serves a burger at Sam’s.Nick Otto/Special to The ChronicleShow MoreShow Less 3of6 Michael Schaff, visiting from Mandan, N.D., eats a burger at Sam’s in San Francisco, which is expected to receive Legacy Business Registry status this week.Nick Otto/Special to The ChronicleShow MoreShow Less 4of6 The menu at Sam’s Burgers, which was recently approved for addition to San Francisco’s Legacy Business Registry.Nick Otto/Special to The ChronicleShow MoreShow Less