Grilled Swordfish with Tomatoes and Watercress

I adore a simple grilled fish: I love how this noninvasive cooking technique enhances the clean flavor of the ingredients that it is applied on, which, when you have great fish, is all you need. This combination of grilled fish with a bracing salsa-like accompaniment is a real winner for groups, dinner parties, backyard gatherings—anytime you want to please a crowd without spending hours in the kitchen. The swordfish could easily be swapped out for a different fish such as tuna, yellowtail,