Broiled Arctic Char with Basil Sauce and Tomato

1/2 cup firmly packed fresh basil leaves
1/4 teaspoon minced garlic
1/8 teaspoon salt
3 1/2 tablespoons extra-virgin olive oil
1/4 teaspoon packed light brown sugar
1 teaspoon red-wine vinegar
1 small tomato, cut into 1/3-inch-thick slices
1 6-ounce piece arctic char fillet
Accompaniment: fresh-cut lemon

Blanch basil in a 1-quart saucepan of boiling water 15 seconds, then transfer with a slotted spoon to a bowl of ice and cold water to stop cooking.

Squeeze excess liquid from basil and purée in a blender with garlic, salt, and 3 tablespoons oil.

Preheat broiler. Line rack of a small broiler pan with foil, then oil foil.

Stir together brown sugar and vinegar until sugar is dissolved, then overlap tomato slices on a large plate and drizzle with vinegar mixture. Season with salt.

Put fish, skin side down, on pan, then season with salt and pepper and drizzle with remaining 1/2 tablespoon oil.

Broil fish about 3 inches from heat (without turning) until just cooked through, 6 to 8 minutes.

Put fish on top of tomatoes and spoon basil sauce on top. Serve with lemon.

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