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Here is interesting cocktail for those wishing to think of New Orleans. It's a bit odd in that it calls for Peychaud rather than Angostura bitters. According to this, you will have tough luck finding the former outside of New Orleans.

What gives me pause is that it calls for the dread absinthe. And this sentence is going to give me nightmares:

Note: I actually keep my absinthe in a small atomizer bottle and just spray the glass with this to coat.