As the name implies, two ingredients create a world of possibilities at this always-packed Mission stalwart. Affable service, plus a space that’s both buzzy and approachable, partly explain the evergreen appeal of this humble space, but it’s really the kitchen’s vibrant blend of Californian and Italian cuisines that draws the crowds. An ever-changing array of expertly handmade pastas is the main event, with creative offerings like squid ink bucatini sauced with octopus ragu and Calabrian chili crunch, plus lesser-known regional shapes, like a plate of lusciously taleggio-filled scarpinocc. The option of half portions helps to ease the difficulty of choosing only one, but for those seeking even more variety, a multicourse pasta tasting is a real treat.