Preheat a grill to high. Toast the coriander seeds in a dry skillet over medium-high heat, tossing, about 3 minutes. Crush the seeds on a cutting board (the bottom of a measuring cup works well), then pulse with the parsley, cilantro, ginger, vegetable oil, 1/2 teaspoon salt and 1 tablespoon water in a food processor to make a coarse mixture.

Toss the corn and tomatoes with 2 teaspoons of the herb mixture in a bowl and season with salt.

Tear off four large sheets (about 16 inches long) of heavy-duty foil. Place one piece of fish in the center of each. (If the ends of the fillets are thin, tuck them under.) Top with a spoonful of the remaining herb mixture and surround with the corn-tomato relish. Fold up the ends of the foil and seal into packets, leaving room inside for heat circulation.

Grill the packets, covered, until the fish is just cooked through, 8 to 10 minutes. Carefully open the packets and slide the fish and vegetables onto plates. Top with more cilantro and serve with lime.

Per serving: Calories 323; Fat 12 g (Saturated 2 g); Cholesterol 140 mg; Sodium 383 mg; Carbohydrate 21 g; Fiber 4 g; Protein 34 g

Photograph by Antonis Achilleos