"Here Dijon mustard serves a dual purpose: It flavors the delicate fish, and helps the breadcrumb coating stay in place as the fish cooks. Tilapia can be used in place of the flounder...."
INGREDIENTS
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6 plum tomatoes, halved lengthwise
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2 tablespoons olive oil, plus more for one of the baking sheets
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3/4 teaspoon dried tarragon
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Pinch sugar
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Coarse salt and ground pepper
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1/3 cup mayonnaise
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1 tablespoon fresh lemon juice
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3 slices white sandwich bread (about 1 ounce each), torn into large pieces
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4 flounder fillets (1 1/2 pounds total)
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2 tablespoons Dijon mustard