While it’s typical to measure five pounds of crawfish per guest, it’s also easy to assume that, with so many other ingredients, this recipe will easily satisfy eight people.
Fill a very, very large pot with 10 gallons water, leaving plenty of room for all the other ingredients. (Or you can use 2 or even 3 large pots, divvying all the ingredients evenly among them.) Bring the water to a boil with the kosher salt, boiling spices, lemons, cayenne, garlic, onions, celery, and bell peppers if using, and the oil. Reduce the heat and gently simmer for 10 minutes.
Add the smoked sausage, potatoes, corn, and artichokes, if using, and continue to simmer for 15 minutes.
If using fresh crawfish, add the crawfish now along with the mushrooms, if using. Cover and simmer for another 10 minutes. Turn off the heat. If using frozen or already boiled crawfish, add the crawfish now along with the mushrooms, if using. Cover and simmer for 15 to 20 minutes.
Strain everything from the boiling liquid, preferably using a large colander, which will make it easier to fish out all the good parts (that is, the crawfish and vegetables) from the rest. Dump the good parts that you strained onto a picnic table covered with newspaper (preferably the Times-Picayune). Then feast while drinking an Abita Amber beer.