• prep: 20 min
• cook: 0 hr
• total: 20 min

servings:

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.

• 6 plum tomatoes, halved lengthwise
• 2 tablespoons olive oil, plus more for one of the baking sheets
• 3/4 teaspoon dried tarragon
• 1 pinch sugar
• Coarse salt and ground pepper
• 1/3 cup mayonnaise
• 1 tablespoon fresh lemon juice
• 3 slices white sandwich bread (about 1 ounce each), torn into large pieces
• 4 flounder fillets (1 1/2 pounds total)
• 2 tablespoons Dijon mustard

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