Are you really surprised I'm the first redneck to answer?
:-)
Crawfish taste basically like shellfish. Mostly like dungeness crab (in my opinion). If you like crableggs you'll like crawdads.
The best way to cook them is to boil or grill (ideally - if you have time) - like any shellfish. In my area (Colorado) it's called a cajun boil.
There is a great seasoning called Nantucket Offshore - I swear by it for any shellfish!
www.nantucketoffshore.com You can also get it at Safeway.






