Make the Rich Chicken Stock and reserve the shredded chicken meat and broth as the recipe instructs. If using it the same day, let the broth cool before starting the gumbo.
Combine the oil and flour in a heavy-bottomed pot, like a cast iron or enameled cast iron skillet or Dutch oven. Stir constantly over medium-high heat with a wooden spoon until it begins to color ever so slightly, and is what is called a blonde roux. Turn the heat down now to medium or medium-low and cook until the roux is the color of peanut butter. Continue to cook, be even more vigilant about stirring and paying attention to what is going on in the pot. If at any point you feel the roux is browning too fast, turn the heat down further.
Once the roux changes from the color of a copper penny to one of milk chocolate, immediately add the onions, celery, garlic, bell pepper, cayenne and sausage, and cook, stirring, until the vegetables are softened, 5-7 minutes. If the broth has cooled by this time, add it to the roux mixture along with the salt, black pepper and bay leaf, and bring to a gentle simmer. Continue to simmer, skimming any foam or excess oil that comes to the top, until the sauce is flavorful and thickened to the desired consistency, and any trace of floury taste is gone, about 2 hours.
Add the shredded chicken, green onions and parsley to the gumbo, and continue to simmer about 30 minutes longer. Don’t stir too much or the chicken will fall apart into shreds. Adjust the thickness, if necessary, by adding water or more broth. Adjust the seasoning with salt and cayenne as needed.
Serve the gumbo in shallow bowls over hot white rice. Have the hot sauce and filé at the table for guests to use to their liking.
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