01 - Fill an extra-large stockpot with 4 gallons of water. Add Cajun seasoning, bay leaves, black peppercorns, paprika, salt, hot sauce, quartered onions, halved garlic head, and lemon halves. Squeeze the lemon juice into the water before adding the rinds. Bring the mixture to a rolling boil over high heat.
02 - Add the halved red potatoes to the boiling broth. Cook for 10 minutes until partially tender.
03 - Add the sliced smoked sausage and corn pieces to the pot. Boil for an additional 10 minutes until the sausage is heated through and corn begins to tenderize.
04 - Add the live crawfish to the pot. Stir thoroughly to distribute heat evenly. Cover the pot and boil for 5 to 7 minutes, or until the crawfish shells turn bright red and the meat is opaque and cooked through.
05 - Turn off the heat completely. Allow the crawfish and vegetables to soak in the seasoned broth for an additional 15 to 20 minutes. This resting period enables the spices to fully penetrate the seafood and vegetables for optimal flavor.
06 - Using a slotted spoon or strainer, transfer the crawfish, potatoes, sausage, and corn to a large serving platter. Alternatively, spread the boiled feast over newspaper-lined tables for traditional presentation. Sprinkle generously with additional Cajun seasoning and chopped parsley. Serve with lemon wedges and melted butter on the side.