Blend shrimp shells and 1 cup of water in a food processor or blender. Strain liquid into dutch oven pot. Add all the other ingredients to the pot. Bring to a boil, then reduce to simmer for 45 mins to an hour.
Strain the liquid into a large bowl. Set aside
Make the Roux
Heat oil in a pan on medium low heat. Add flour and mix in well until consistency is a smooth paste. Stir constantly until roux reaches desired color. Go for a chocolate dark color which will require about 45 minutes.
Make the Gumbo
During last minute or so of cooking the roux add the onions, celery, and peppers and mix in well. Saute 3-4 minutes then add the garlic, cooking for about 30 secs.
Add frozen okra, plus a ¼ of the spice mix. Cook for 1-2 minutes.
Add beer deglazing the pan. Allow the alcohol to cook off and the beer to reduce slightly.
Add stock, bay leaf, half the remaining spices, fish sauce and Worcestershire sauce. Mix and allow everything to simmer covered for about 45 minutes.
Add the seafood plus last of the cajun seasoning and simmer 10-15 minutes.
Serve over rice.
Notes
Season with the cajun seasoning as you go for well seasoned gumbo
Use your preferred mix of seafood. Crab is typically used, but I'm allergic so skipped
Time permitting make your own stock, otherwise use a low sodium store bought version
Seafood is delicate so don't overcook. Add late and watch carefully.
Dark roux requires lots of time, so stretch those forearms as they will get work.
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