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How to boil crawfish
Buy live crawfish.
Plan on ordering enough crawfish so that each person at your party or dinner gets 2-3 pounds. Most of the weight will get discarded since crawfish come with their shells on.
Source the crawfish from seafood and grocery stores or crawfish trucks, which sell crawfish when it's in season. If you don't have a source of crawfish in your area, purchase it online from a vendor such as louisiana crawfish co.