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Blackened Fish Sandwiches with Horseradish Tartar Sauce

Ingredients

• 1/4 cup mayonnaise
• 1/4 cup sour cream
• 3 tablespoons shallot minced; from 1 medium shallot
• 2 tablespoons flat-leaf parsley minced; fresh
• 1 1/2 tablespoons horseradish drained; prepared
• 1 1/2 tablespoons lemon juice fresh
• 1 1/2 tablespoons cornichons minced; about 4 small cornichons
• 1 tablespoon capers chopped; drained
• 1/4 teaspoon kosher salt
• 1/4 teaspoon black pepper
• 1 teaspoon hot paprika
• 1 teaspoon garlic powder
• 1 teaspoon oregano minced; fresh
• 1 teaspoon thyme minced; fresh
• 1 teaspoon kosher salt
• 1/2 teaspoon black pepper
• 4 haddock fillets 4- to 5-ounce; skinless; about 3/4 inch thick
• 1/4 cup plus 2 teaspoons unsalted butter divided
• 4 brioche hamburger buns split
• 1 tablespoon canola oil
• Butter lettuce leaves for serving

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