ACCOMPANIED BY CRUSTY BREAD, this salad makes a fresh light supper in summer, with a lovely contrast in flavors between the salty fish, peppery arugula and the grapefruit. Red or pink grapefruit tend to pack a bigger nutritional punch—especially vitamin A and the antioxidant lycopene—and look prettiest in this salad I think, but when I cut this one open, surprise, surprise, it was white. Better luck next time.