01 - Preheat grill to medium-high heat, approximately 375-400°F.
02 - Place Cajun beef sausages on the preheated grill. Cook for 10-12 minutes, turning every 2-3 minutes to ensure even browning on all sides. Sausages are done when internal temperature reaches 160°F and they are well browned. Remove from grill and let rest for 2 minutes.
03 - While sausages are grilling, split the baguettes or rolls open. Place cut-side down on the grill for 1-2 minutes until lightly golden and crisp.
04 - In a small mixing bowl, combine mayonnaise, Dijon mustard, Creole mustard, ketchup, minced parsley, hot sauce, paprika, garlic powder, onion powder, and lemon juice. Whisk vigorously until completely smooth and well incorporated. Season with salt and pepper to taste.
05 - Spread a generous layer of remoulade sauce on both cut sides of each toasted baguette. Layer bottom half with shredded lettuce, followed by tomato slices, pickles, and red onion. Place one grilled sausage on top of the vegetables.
06 - Close sandwiches with top half of bread. Press down gently to compact ingredients. Serve immediately while sausages are still warm and bread is crisp.