Crispy Panko Fish Sandwich with Tartar Sauce

Why You’ll Love This Recipe

• Ultra-crisp panko crust that stays crunchy from first bite to last.
• Bright, tangy tartar sauce with dill, lemon, and pickles to cut through the richness.
• Fast weeknight-friendly method with simple pantry staples.
• Tested timings and temperatures for consistently juicy fish.

Grocery List

• Produce: Lemons, fresh dill or parsley, iceberg lettuce, shallot (optional)
• Dairy: Butter, eggs
• Pantry: Cod or haddock fillets, mayonnaise, Dijon mustard, dill pickles + pickle brine, capers (optional), all-purpose flour, cornstarch, baking powder, panko breadcrumbs, neutral frying oil, kosher salt, black pepper, paprika, garlic powder, onion powder, brioche or potato buns

Full Ingredients

For the Crispy Fish

• 4 skinless cod or haddock fillets (4–5 oz/115–140 g each), about 1/2–3/4 inch thick
• 1 tsp kosher salt, divided (plus more for finishing)
• 1/2 tsp freshly ground black pepper, divided
• All-purpose flour, 1 cup (125 g)
• Cornstarch, 2 tbsp (16 g)
• Baking powder, 1/2 tsp (2 g)
• Paprika, 1 tsp
• Garlic powder, 1 tsp
• Onion powder, 1/2 tsp
• 2 large eggs
• Water, 1 tbsp (15 ml)
• Panko breadcrumbs, 2 cups (100 g)
• Neutral oil for frying (canola, peanut, or sunflower), about 1.5 quarts (1.4 L), enough for 1.5 inches depth

Tangy Tartar Sauce

• Mayonnaise, 2/3 cup (160 g)
• Dill pickles, finely chopped, 3 tbsp (30 g)
• Pickle brine, 1 tbsp (15 ml)
• Lemon juice, 1 tbsp (15 ml)
• Dijon mustard, 1 tsp (5 ml)
• Capers, drained and chopped, 1 tbsp (10 g, optional)
• Fresh dill or parsley, finely chopped, 1 tbsp (3 g)
• Grated shallot, 1 tsp (or 1/2 tsp onion powder)
• Pinch sugar (about 1/4 tsp), optional
• Freshly ground black pepper, 1/4 tsp; kosher salt to taste

For Assembly

• 4 brioche or potato buns
• Butter, 2 tbsp (28 g), softened
• Iceberg lettuce, finely shredded, 2 cups (120 g)
• Dill pickle chips, 12–16 slices
• Lemon wedges, for serving

Step-by-Step Instructions

Step 1: Mix the tartar sauce

In a small bowl, combine the mayonnaise, chopped dill pickles, pickle brine, lemon juice, Dijon, capers (if using), chopped dill or parsley, grated shallot, sugar, and black pepper. Taste and season with a pinch of kosher salt if needed. Cover and refrigerate to let the flavors meld while you prepare the fish.

Step 2: Season and rest the fish

Pat the fillets very dry with paper towels. Sprinkle both sides with 3/4 tsp kosher salt and 1/4 tsp black pepper (reserve the remaining to season the dredge). Let the fish rest for 10 minutes at room temperature; this light dry brine improves seasoning and helps the crust adhere.

Step 3: Heat the oil and prep your station

Pour oil into a heavy Dutch oven to a depth of about 1.5 inches. Heat to 350°F (175°C), monitoring with a deep-fry thermometer. Place a wire rack over a rimmed baking sheet for draining and set your oven to 250°F (120°C) to keep finished fillets warm. Split the buns so they’re ready to toast later.

Step 4: Build the breading line

In one shallow dish, whisk together the flour, cornstarch, baking powder, paprika, garlic powder, onion powder, and the remaining 1/4 tsp each of salt and pepper. In a second dish, beat the eggs with 1 tbsp water. In a third dish, add the panko. Work one fillet at a time: dredge in the seasoned flour (shake off excess), dip into the egg, then press firmly into the panko to coat completely. Transfer coated fillets to a plate and let them sit 5 minutes; this helps the crust set.

Step 5: Fry to shattering crisp

Fry 2 fillets at a time, lowering them carefully into the 350°F oil. Cook 3–4 minutes per side until deep golden, the crust sounds crisp when tapped, and the fish flakes easily with a fork (internal temp about 145°F/63°C). Adjust heat to keep oil between 325–350°F. Transfer to the rack, sprinkle with a pinch of salt, and keep warm in the oven while you fry the remaining fillets.

Step 6: Toast the buns and prep the fixings

Spread the cut sides of the buns with butter. Toast in a skillet over medium heat until golden, 1–2 minutes. Pile the shredded lettuce into a bowl and pat the pickle chips dry so they don’t sog out the sandwich.

Step 7: Assemble and serve

Spread tartar sauce on both cut sides of each bun. Layer lettuce on the bottom bun, add a hot, crispy fillet, and top with pickle chips. Spoon on a little extra tartar if you like, cap with the top bun, and serve immediately with lemon wedges.

Pro Tips

• Temperature matters: keep oil between 325–350°F for maximum crunch without greasy fish.
• Crust adhesion: let breaded fillets rest 5 minutes before frying so the panko sets.
• Shallow, quick toast: toasting the buns adds flavor and prevents sogginess.
• Crush panko slightly: a gentle squeeze in your hands gives a tighter, more even crust.
• Season while hot: a light pinch of salt right out of the oil makes flavors pop.

Variations

• Air Fryer: Mist breaded fillets with oil. Cook at 400°F (205°C) for 10–12 minutes, flipping halfway, until crisp and cooked through.
• Spicy: Add 1/2–1 tsp cayenne to the flour and 1 tsp hot sauce to the egg. Stir chopped pickled jalapeños into the tartar.
• Gluten-Free: Use rice flour in place of all-purpose flour, gluten-free panko, and GF buns.

Storage & Make-Ahead

Tartar sauce can be made up to 3 days ahead; keep refrigerated. Bread fish up to 30 minutes ahead and refrigerate uncovered for extra crunch. Fried fish is best fresh, but leftovers keep 1–2 days in the refrigerator; re-crisp on a rack at 400°F (205°C) for 8–10 minutes. Avoid microwaving, which softens the crust. Assemble sandwiches just before serving.

Nutrition (per serving)

Approximate per sandwich: 720 calories; 40 g fat; 56 g carbohydrates; 32 g protein; 3 g fiber; 1220 mg sodium. Values will vary based on oil absorption, bun size, and exact ingredients.