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The Ultimate Filet O Fish Sammie

This recipe crafts a gourmet fish sandwich featuring panko-crusted halibut fillets baked until crispy. It's assembled on a toasted sourdough baguette with a bright lemon-herb mayonnaise, fresh arugula, thick-cut tomato, and creamy avocado slices for a flavorful and satisfying meal.
Prep Time 25 minutes
Total Time 25 minutes
Servings 2 people

Equipment

  • 1 Sheet Tray
  • 3 Containers For breading station (flour, egg mixture, panko)
  • 1 Mixing Bowl For mayonnaise
  • 1 Sharp Knife For slicing fish, vegetables, and baguette
  • 1 Cutting Board

Ingredients
  

Main

  • 1 whole tail piece fresh halibut 1 1/4 inches thick, by about 1 foot long
  • 1 cup all-purpose flour
  • 1 egg beaten
  • 1 cup milk
  • 1 1/2 cups panko bread crumbs
  • Kosher salt and freshly ground black pepper
  • Extra-virgin olive oil
  • 1 cup mayonnaise store-bought
  • 1 lemon juiced
  • 1 handful fresh parsley leaves finely chopped
  • 1 handful fresh basil leaves finely chopped
  • 1 handful chives finely chopped
  • 2 tablespoons olive oil
  • 1 foot long sourdough baguette
  • 1 cup lightly packed hydroponic arugula leafy variety, with stems
  • 1 ripe avocado cut in thick slices
  • 1 beefsteak tomato cut in thick slices

Instructions
 

  • Preheat oven to 350 degrees F.
  • Put a large sheet tray in oven and heat it for 1/2 hour.
  • Begin by patting the halibut fillet dry. If you have a tail end piece cut the fillet down the middle so you can invert the 2 pieces next to each other to form a nice rectangular shape that matches the bread. Set up a breading station with flour, beaten egg and milk, and bread crumbs in separate containers. Season with salt and pepper. Dip each fillet into the flour, egg mixture, and then panko. Set aside on a tray at room temperature to let the coating set.
  • Pull out sheet tray from oven, add a 2-count of oil and transfer breaded fish to tray. Sprinkle with olive oil. Bake for 30 minutes or until golden brown.
  • Combine lemon herb mayonnaise ingredients in a bowl and blend until well combined. Season with salt and pepper, to taste. Split the baguette in half horizontally. Open it up and toast it in a hot oven until just warmed through. Smear each half with lemon herb mayonnaise and stack up arugula, tomato and avocado on 1 half. Top with crispy panko fish fillets and top with the other half of bread. Skewer in 2 places and cut across the middle. Serve with more lemon-herb mayonnaise on the side.

Notes

Ensure the halibut fillets are thoroughly patted dry before breading; this helps the panko adhere better and crisp up nicely. Preheating the sheet tray is crucial for achieving a golden brown and crispy bottom crust on the fish during baking. Avoid overcrowding the tray, as this can steam the fish instead of baking it crisp. Let the breaded fish sit for a few minutes before baking to allow the coating to set. For the lemon-herb mayonnaise, using fresh, finely chopped herbs will provide the best flavor and aroma.