01 - Fill a large stockpot with 6 quarts of water. Add seafood boil seasoning, salt, cayenne pepper, bay leaves, black peppercorns, hot sauce, quartered onions, halved garlic head, and lemon halves. Bring to a rolling boil over high heat.
02 - Add halved red potatoes to the boiling liquid. Cook for 10 minutes until potatoes begin to soften.
03 - Add sausage pieces and corn sections to the pot. Boil for 7 minutes to cook through and infuse flavors.
04 - Add live crawfish to the pot. Cover and cook for 7 to 10 minutes, stirring occasionally. Cook until crawfish shells turn bright red and tails curl tightly.
05 - Turn off the heat. Let all ingredients soak in the seasoned broth for 10 to 20 minutes. Longer soaking time intensifies spice and flavor absorption.
06 - Drain the boil using a large colander. Discard lemon halves, garlic head, and bay leaves from the mixture.
07 - Transfer crawfish, potatoes, corn, and sausage to a large serving tray or newspaper-lined table. Drizzle with melted butter and sprinkle with chopped fresh parsley. Serve immediately.