Spicy Stew with Chicken, Shrimp, and Okra

This is a very forgiving, very flexible soup. Sometimes I add rice (about 1 cup cooked) to make it heartier, or andouille (4 ounces or so) for a zingier flavor. It is best to make a day or two before you plan on serving it, as a night in the fridge does wonders to marry and intensify the flavors.
Yields about two quarts.

Ingredients:
unsalted butter 2 tablespoons
vegetable oil 1/3 cup
unbleached all-purpose flour ¼ cup
yellow onion 1 cup diced
celery ½ cup diced
red bell pepper ½ cup diced
garlic lots minced or pressed
tomato concasse, with juice 7 ounces
chicken stock enough to cover the whole lot
sliced okra ½ cup I use the frozen stuff, shhh!
chicken meat 10 ounces cooked and shredded
shrimp 8 ounces cooked and halved
oregano
thyme
chili powder
cayenne
sea salt
black pepper freshly ground
Procedure:
  1. In your soup pot over medium-high heat, melt oil and butter together. Whisk in flour to make a roux. Stir constantly until mixture looks like wet sand and smells like popcorn.
  2. Stir in onion, celery, garlic, and bell pepper to coat in roux.
  3. Sprinkle in herbs and spices and stir to mix.
  4. Cover with chicken stock, add tomatoes, chicken, and shrimp.
  5. Bring to a boil, reduce to a simmer, and cook about 10 minutes, until the vegetables are cooked but not limp. The roux will also cook and thicken the soup a bit.
  6. Stir in okra.
  7. Rest in refrigerator overnight, warm, taste and adjust seasonings if necessary.