This smooth soup is a specialty of the house at Bayona in New Orleans. What seems like a prodigious quantity of garlic and onions is mellowed by the long, slow cooking. If you can, make the soup a day ahead; the flavor will be even better.
Experiment with either a red, such as one of the fruity wines from the Corbières region of France, or a white, such as a fairly high-alcohol wine from the Côtes-du-Rhône or Côtes de Provence in France.