01 - Set up your grill or grill pan over medium-high heat, aiming for approximately 375-400°F. Allow the grates to preheat for at least 5 minutes to ensure proper searing.
02 - Place the Cajun beef sausages directly on the preheated grill grates. Cook for 10-12 minutes, turning every 3-4 minutes to achieve even browning on all sides. The sausages should reach an internal temperature of 160°F and develop a nice charred exterior. Transfer to a plate and let rest for 2 minutes to allow juices to redistribute.
03 - While the sausages finish cooking, place the split baguettes or rolls cut-side down on the grill. Toast for 1-2 minutes until golden brown and lightly crisp, watching carefully to prevent burning.
04 - Combine the mayonnaise, Dijon mustard, Creole mustard, ketchup, minced parsley, hot sauce, paprika, garlic powder, onion powder, and lemon juice in a small mixing bowl. Whisk vigorously until fully incorporated and smooth. Season with salt and pepper to taste, adjusting spice levels as desired.
05 - Spread a generous layer of the prepared remoulade on both the top and bottom halves of each toasted baguette. Build each sandwich by layering shredded iceberg lettuce, tomato slices, dill pickles, and red onion on the bottom half. Place one grilled sausage on top of the vegetables.
06 - Close each sandwich with the top half of the baguette. Press down gently to compress the layers slightly. Serve immediately while the sausages are still warm and the bread maintains its slight crunch from grilling.