I made this up after looking at all the leftover corn and potatoes (and crawfish) from our last crawfish boil. The leftovers just screamed "USE US!" so I did. I usually have leftover Andouille, onion, garlic, corn, and potatoes in addition to the crawfish. If I have other stuff leftover, like mushrooms, I throw that in the stock. The good thing is, if you had anybody worth his salt actually doing the boiling, all that residual spice from the boil will come out in the chowder, so you shouldn't have to season at all!