01 - In a large stockpot (at least 10 quarts), combine water, Cajun seasoning, salt, paprika, cayenne pepper, bay leaves, black peppercorns, quartered onion, and halved garlic. Squeeze the lemons into the water before adding the halves. Bring the mixture to a rolling boil.
02 - Add the baby red potatoes to the boiling liquid. Cook for 10 minutes.
03 - Add the sliced andouille sausage and corn to the pot; continue boiling for 10 minutes.
04 - Add the live crawfish to the pot. Stir gently to submerge, then cover and cook for 5-7 minutes, or until the crawfish turn bright red.
05 - Turn off the heat. Allow all contents to soak in the seasoned water for an additional 10-15 minutes to maximize flavor absorption.
06 - Carefully drain the contents of the pot. Transfer to a large serving platter or a clean, parchment-lined surface. If desired, toss with melted butter and garnish with fresh chopped parsley.
07 - Serve immediately, providing extra Cajun seasoning and fresh lemon wedges on the side for individual preference.