Cazuela de Mariscos (Seafood Casserole)

A cazuela de mariscos brings the generous feel of a Spanish seafood stew to the table: shellfish and fish served in a shallow, aromatic broth rather than a heavy baked casserole. Saffron, smoked paprika, tomato and fish stock give the sauce its golden-red colour and savoury depth, while dry sherry adds a clean, lightly nutty finish. The seafood is added in stages so the mussels open, the prawns turn just pink and the white fish stays delicate. Served hot with crusty bread, it is the kind of dish made for spooning up every last bit of broth.
Cuisine style Spanish seafood cooking
Cooking style One-pot cooking
Time commitment Under 1 hour

Why this recipe works

  • Layered broth: Saffron, smoked paprika, tomato, fish stock and sherry build a savoury base before the seafood is added.
  • Fast seafood cooking: The broth does most of the work, while the fish, prawns and mussels cook in just a few minutes at the end.
  • Ideal with bread: The loose, aromatic broth is made for serving in bowls with crusty bread to catch every last spoonful.

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Timing notes

  • Serve straight away: Seafood is at its best as soon as it is cooked; letting it sit too long in the hot broth can make the prawns and fish firm.
  • Prep before simmering: Scrub the mussels, cut the fish and have the prawns ready before adding seafood to the pan, as the final stage moves quickly.

Ingredient notes

  • Saffron matters: Steeping the saffron in warm stock helps release its colour and aroma before it is stirred into the broth.
  • Check the mussels carefully: Use fresh mussels with intact shells, discard any that do not close when tapped, and remove any that stay closed after cooking.
  • Adjust the sherry gently: Dry sherry adds brightness and depth, but it should support the seafood rather than dominate the broth.

Common mistakes

  • Overcooking the seafood: Add the fish and prawns only once the broth is ready, then simmer just until the fish turns opaque and the prawns are pink.
  • Boiling too hard: Keep the pan at a gentle simmer once the seafood goes in; vigorous boiling can toughen prawns and break up the fish.
  • Storing for too long: Cool leftovers quickly and refrigerate, but avoid freezing; the seafood texture will suffer after thawing.

Serving ideas

  • Serve with crusty bread: Warm bread is the most useful side here, as it soaks up the saffron and tomato broth without competing with the seafood.
  • Finish with parsley: A final scattering of fresh parsley adds colour and a clean herbal lift to the rich broth.
  • Pair with a dry white wine: Choose a crisp, dry white wine that echoes the sherry’s brightness and keeps the dish feeling light.

Equipment you'll need

Ingredients
Instructions
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  1. Put the saffron in a small bowl and ladle over about 3 tbsp of the fish stock. Leave to steep while you prep the rest of the ingredients.
  2. Heat the olive oil in a casserole over medium heat. Finely chop the onion, add it to the pan, and cook for 6 to 8 minutes until soft and sweet. Crush in the garlic and cook for 1 minute more.
  3. Stir in the smoked paprika for 20 seconds, then add the tomatoes and the remaining fish stock, plus the saffron and its soaking liquid. Bring to a gentle simmer and cook for 10 minutes, stirring occasionally, until the broth tastes rounded and the tomatoes have broken down.
  4. Add the sherry and return to a gentle simmer. Scrub and debeard the mussels, discarding any that are cracked or do not close when tapped. Add the mussels, cover, and cook for 4 to 5 minutes, shaking the pan once, until they open.
  5. Cut the white fish into large bite-size pieces and add to the broth along with the prawns. Simmer gently for 3 to 5 minutes until the fish is just opaque and the prawns are pink and cooked through. Discard any mussels that have not opened.
  6. Roughly chop the parsley and stir most of it through the casserole. Taste and adjust with a little more sherry if you like, then scatter over the remaining parsley and serve hot.

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Recipe notes

Serving suggestions

This recipe pairs well with:

Crusty bread

Tips

  • Keep the heat low once the seafood goes in; a gentle simmer helps the fish stay tender and stops the prawns turning rubbery.
  • If you are serving with crusty bread, warm it briefly so it soaks up the broth without cooling the casserole.
  • If you are pregnant, elderly, or immunocompromised, make sure the prawns are fully cooked and the mussels are piping hot; discard any mussels that do not open.

Substitutions

  • Replace dry sherry with dry white wine for a similar finish.
  • Replace fresh parsley with fresh coriander for a different herbal note.
  • Replace white fish fillet with cod fillet for a firmer texture.

Storage

  • Refrigerate up to 2 days
  • Cool quickly, then refrigerate in a sealed container. Reheat gently in a saucepan over low heat until piping hot, stirring carefully so the fish stays in pieces; do not reboil hard.

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Cazuela de Mariscos (Seafood Casserole)
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Recipe overview

  • Servings: 4 servings
  • Total time: 45min (25min active)
  • Difficulty: Medium
  • Cuisine: Spanish
  • Allergens:
    Fish Molluscs
With serving suggestions One pot

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