Blackened Fish Sandwiches with Horseradish Tartar Sauce

Ingredients

• ¼ cup mayonnaise
• ¼ cup sour cream
• 3 tablespoons minced shallot (from 1 medium shallot)
• 2 tablespoons minced fresh flat-leaf parsley
• 1 ½ tablespoons drained prepared horseradish
• 1 ½ tablespoons fresh lemon juice
• 1 ½ tablespoons minced cornichons (about 4 small cornichons)
• 1 tablespoon drained capers, chopped
• ¼ teaspoon kosher salt
• ¼ teaspoon black pepper
• 1 teaspoon hot paprika
• 1 teaspoon garlic powder
• 1 teaspoon minced fresh oregano
• 1 teaspoon minced fresh thyme
• 1 teaspoon kosher salt
• ½ teaspoon black pepper
• 4 (4- to 5-ounce) skinless haddock fillets (about 3/4 inch thick)
• ¼ 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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