This winning World Championship Gumbo Cook-Off recipe was submitted by Team Bayou Roux & Unlimited from their 2013 championship entry. And it has TOMATOES!
Here's the gist of Sous Vide: put the item you want to cook into a plastic food bag, seal it shut, submerge it into a controlled-temperature bath, and let it cook.
The ingredients for the Amaretto are simple: seeds, grain alcohol, lemon peel, vanilla bean, and sugar/simple syrup. That's it! Oh, and time. Lots of time!