The salad can be refrigerated, covered, overnight. Bring to room temperature before serving.
Toasted baguette slices or thickly sliced country bread.
While most Spaniards would drink red wine with this dishsince most Spaniards drink red wine with everythingit would pair better with a good Spanish rosé (the tannins in red wine sometimes make oily fish taste metallic). Look for one from the Terra Alta region or Jumilla.