First thing is to purge crawfish in a separate tub. to do this you simply dump the crawfish in a wash tub or something of size,fill with water over top of crawfish,and then sprinkle a box of salt all over them. Let crawfish set in the salt water for amount of time it takes to get water boiling in stock pot. Then drain & rinse them real good before adding to the pot. (Note: follow below directions before adding crawfish to pot.).
Fill 100 quart stock pot a lil over half full of water. Add crab boil, cayenne pepper, bay leaves, butter, lemons and salt. Bring to a boil for 10 minutes.
Add potatoes, corn, onion, mushrooms, and cut garlic pods. Boil another 10 minutes Add crawfish, bring back to a boil for about 5 minutes.
Cut fire, put in 1 bag of ice and immediately cover pot with lid. Let soak 20 to 30 minutes.
Drain, throw crawfish in drink box. Sprinkle Tony Chachere's, shake box to mix. Sprinkle and mix until you see spice's on the crawfish good. Enjoy!