Slice giant grouper fillet into generous squares. Remove bones if any.
Peel and dice / slice yellow onion.
Lightly fry onions with a generous amount of butter until soft on medium heat. Add flour, tomato paste, smoked paprika and stir intermittently with each addition. When everything has mixed together, continue stirring for 1 min. Add alcohol of choice and cook off some of the alcohol for thirty seconds to a minute. Add stock and bay leaves. Lower heat and simmer for 15 minutes.
Add squid, prawns, then giant grouper squares to the stew and cook for 5 minutes on low heat. Toss seafood occasionally in the pot.