Heat the ½ cup aceite vegetal in a large Dutch Oven or heavy-bottomed Pot over medium heat. Once shimmering, whisk in the ½ cup harina para todo uso until smooth. Switch to a Wooden Spoon or heat-safe Spatula.

Cook the roux, stirring constantly and scraping the bottom of the Pot, for 25–35 minutes. You're aiming for a deep chocolate-brown color — like dark milk chocolate or a copper penny. Don't rush this step and don't walk away. If it smells burnt, reduce the heat.

Once the roux is dark and fragrant, immediately add the diced 1 cebolla amarilla picada, 1 pimiento verde picado, and 3 tallos de apio picados. The vegetables will sizzle dramatically — this is normal. Stir vigorously to coat everything in the roux and stop the cooking. Cook, stirring frequently, for 6–8 minutes until the vegetables soften.

Add the minced 5 dientes de ajo picados and cook for 1 more minute, stirring constantly, until fragrant.

Add the sliced 12 oz salchicha andouille rebanada en rodajas de ¼ pulgada to the Pot and stir to combine. Cook for 3–4 minutes to lightly brown the sausage and render some of its fat into the base.

Add the 1 ½ lb muslos de pollo sin hueso ni piel cortados en trozos de 1 pulgada, all of the spice blend ingredients (2 tsp condimento cajún, 1 tsp pimentón ahumado, 1 tsp tomillo seco, 1 tsp orégano seco, ½ tsp pimienta negra, ¼ tsp pimienta de cayena agregue más, 2 tsp sal kosher más, 2 tsp salsa Worcestershire, and 2 piece hojas de laurel), and stir well to coat everything evenly.

Pour in the 6 cups caldo de pollo bajo en sodio preferido and add the 1 lata tomates picados with their juices. Stir well, scraping up any bits from the bottom of the Pot. Bring to a boil over high heat, then reduce to a gentle simmer.

Simmer uncovered for 40–45 minutes, stirring occasionally, until the 1 ½ lb muslos de pollo sin hueso ni piel cortados en trozos de 1 pulgada are very tender and the gumbo has thickened and deepened in flavor. Skim any excess fat or foam from the surface as needed.

Stir in the 1 ½ cups okra congelada rebanada, descongelada and cook for 10 minutes. The 1 ½ cups okra congelada rebanada, descongelada adds both flavor and natural thickening to the gumbo.

Add the 1 lb camarones grandes pelados y desvenados and stir to submerge. Cook for 3–5 minutes, just until the 1 lb camarones grandes pelados y desvenados are pink and cooked through. Do not overcook. Remove and discard the 2 piece hojas de laurel. Taste and adjust 2 tsp sal kosher más, ½ tsp pimienta negra, and ¼ tsp pimienta de cayena agregue más as needed.

To serve, place a scoop of cooked Long-Grain White Rice in the center of a wide, shallow Mixing Bowl. Ladle the gumbo generously around and over the Long-Grain White Rice. Garnish with sliced 4 tallos cebollas verdes rebanadas finamente, fresh ¼ cup perejil fresco picado, and a small pinch of 1 tsp polvo de filé para espesar y dar sabor if using. Serve immediately.