Preparation

• Combine the flour, Worcestershire, hot sauce if using, Dijon, garlic powder, scallions, salmon, onion, 1 of the eggs, 1 teaspoon of the Cajun seasoning, 1 teaspoon salt and several grinds of black pepper in a medium bowl and gently stir with a fork until the flour is fully incorporated. Place the mixture in the refrigerator and chill for at least 30 minutes and up to 1 hour.
• Meanwhile, prepare the remoulade sauce by combining the mayonnaise, capers, sweet paprika, cornichons and brine, remaining 2 teaspoons Cajun seasoning and ½ teaspoon salt in a small bowl and set aside. (The sauce can be refrigerated, covered, up to 1 hour; serve chilled or at room temperature.)
• Lightly beat the remaining egg in a small bowl. Place the panko in another small bowl and dust your hands lightly with flour. Using a ¼ cup measuring cup, scoop the salmon mixture, shape it into an oblong croquette about 2 inches long and set on a large plate. Repeat to make a total of 8 croquettes.
• Working 1 croquette at a time, dip into the egg and then roll in the panko to coat completely, gently pressing so it adheres.
• Heat the canola oil a large skillet over high heat until 350 degrees F on a deep-fry thermometer. Line a plate with paper towels.
• Carefully place the croquettes in the oil, making sure to leave space in between to ensure even cooking. Cook until golden brown, 2 to 3 minutes per side. Transfer to the lined plate and let cool slightly. Serve warm with the remoulade sauce.