Recipes and Cooking Open-Face Flounder Sandwich 5.0 (6) Flounder has a firm texture and a mild, sweet taste. Tilapia, grouper, or catfish would be equally delicious in this fish sandwich. By Anna Kovel Published on May 16, 2016 Print Share Share Tweet Pin Email Photo: Blaine Moats Prep Time: 20 mins Cook Time: 4 mins Total Time: 24 mins Servings: 4 Jump to Nutrition Facts Ingredients 1 lemon, halved ⅓ cup mayonnaise 1 shallot, minced 1 tablespoon pickle relish 1 teaspoon Dijon-style mustard Kosher salt and freshly ground black pepper 1 ½ pound flounder or other firm white fish, cut into 4 portions 2 tablespoon all-purpose flour 3 tablespoon vegetable oil 4 slices sourdough bread, toasted 4 cup mixed herbs and greens, such as parsley, chives, basil, cilantro, spinach and/or sorrel, coarsely chopped Directions Juice half of the lemon. Cut remaining half into wedges. For sauce, in bowl combine juice, mayonnaise, shallot, relish, and mustard. Season with black pepper. Lightly season flounder with kosher salt. Sprinkle flour onto a large plate. Dip fish into flour, shaking off excess. In a large skillet heat oil over medium-high heat. Carefully add fish to skillet (do not crowd; cook in batches if necessary). Cook 4 to 6 minutes per half-inch thickness or until fish flakes easily with a fork, turning once. Spread sauce on each bread slice; sprinkle with half the herbs. Top with fish and remaining herbs. Serve with lemon wedges. Print Nutrition Facts (per serving) 555 Calories 29g Fat 39g Carbs 37g Protein Show Full Nutrition Label Hide Full Nutrition Label Nutrition Facts Servings Per Recipe 4 Calories 555 % Daily Value * Total Fat 29g 37% Saturated Fat 4g 20% Cholesterol 89mg 30% Sodium 841mg 37% Total Carbohydrate 39g 14% Total Sugars 4g Protein 37g Vitamin C 85.8mg 429% Calcium 165mg 13% Iron 7mg 39% Potassium 954mg 20% Folate, total 192.9mcg Vitamin B-12 1.7mcg Vitamin B-6 0.6mg *The % Daily Value (DV) tells you how much a nutrient in a food serving contributes to a daily diet. 2,000 calories a day is used for general nutrition advice.