Marmitako de Bonito (Basque Tuna and Potato Stew)

In Basque coastal cooking, marmitako is a hearty tuna and potato stew with a broth that is savoury, gently sweet and deeply comforting rather than heavy. Potatoes simmer in fish stock with softened onion, red pepper, tomato, bay and sweet paprika, releasing enough starch to give the stew its characteristic silky body. Bonito or tuna is added only at the end, so the chunks stay moist and just cooked instead of becoming firm. Served in deep bowls with plenty of broth, it is practical, robust and satisfying, with a clear focus on good fish, tender potatoes and a well-seasoned base.
Cuisine style Basque seafood stew
Spice level Mild
Cooking style One-pot cooking
Time commitment Under 1 hour

Why this recipe works

  • Deep savoury base: Slowly softened onion, pepper, garlic, tomato and sweet paprika create a rich foundation before the fish stock is added.
  • Naturally thickened broth: Chunky potatoes release starch as they simmer, giving the stew body without cream or flour.
  • Tender fish finish: Adding the tuna at the end keeps it just cooked and moist, which is essential to the character of marmitako.

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Timing notes

  • Serve soon after adding the tuna: The stew is at its best shortly after the fish has turned opaque and rested briefly in the hot broth.
  • Let it settle before serving: A short rest off the heat helps the tuna finish gently and allows the broth to thicken slightly.

Ingredient notes

  • Choose firm tuna steak: Use a tuna steak that can be cut into large chunks so it holds its shape in the stew.
  • Keep the potatoes chunky: Larger bite-sized potato pieces help create the classic hearty texture and prevent the stew from becoming too loose.
  • Use sweet paprika: Sweet paprika gives warmth and colour without turning the stew spicy.

Authenticity notes

  • Basque coastal style: Marmitako is closely associated with Basque seafood cooking, where tuna, potatoes and peppers are simmered into a practical fisherman-style stew.
  • Simple bowl serving: It is typically served as a generous brothy stew rather than a dry fish dish, with the potatoes and stock as important as the tuna.

Make-ahead tips

  • Make the base ahead: The pepper, tomato, stock and potato base can be prepared in advance; add the tuna only when reheating to serve.
  • Reheat gently: Warm the stew over low heat and avoid a hard boil, especially once the tuna has been added, to keep the fish tender.

Equipment you'll need

Ingredients
Instructions
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  1. Halve and thinly slice the onion. Deseed and slice the red pepper, then peel the garlic and finely chop it.
  2. Heat the olive oil in a large pot over medium heat. Add the onion and red pepper with a pinch of the fine sea salt, then cook for 8 to 10 minutes until softened and lightly golden.
  3. Stir in the garlic for 30 seconds until fragrant. Add the sweet paprika and stir for 10 seconds so it blooms without catching.
  4. Grate the tomatoes on the coarse side of a grater into a bowl, discarding the skins. Tip the tomato into the pot and cook for 5 minutes until reduced and jammy.
  5. Pour in the fish stock and add the bay leaves and remaining fine sea salt. Bring to a gentle simmer.
  6. Peel the potatoes and cut them into chunky, bite-sized pieces. Add to the pot and simmer for 18 to 22 minutes until the potatoes are tender and the broth has thickened slightly.
  7. Cut the tuna into large chunks. Stir it into the hot stew, turn the heat to low, and cook for 2 to 4 minutes until just opaque; do not boil or it will tighten.
  8. Remove the pot from the heat and rest for 5 minutes so the tuna stays tender. Fish out the bay leaves, then ladle into bowls with plenty of broth.

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Recipe notes

Tips

  • For the classic marmitako texture, keep the potato pieces chunky and let the stew simmer gently so the broth turns naturally silky as the potatoes cook.
  • Add the tuna right at the end and keep the stew below a simmer; it should cook through in the residual heat and stay moist.
  • If serving vulnerable groups, ensure the tuna is cooked through to your preferred level rather than leaving it very rare in the centre.

Substitutions

  • Replace Tuna steak with Salmon fillet for a richer, slightly oilier stew; add it at the end in the same way.
  • Replace Red pepper with Yellow pepper for a sweeter flavour and brighter colour.

Storage

  • Refrigerate up to 2 days
  • Cool quickly and refrigerate in a sealed container. Reheat gently in a saucepan over low heat until piping hot, avoiding a hard boil to keep the tuna tender.

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Recipe overview

  • Servings: 4 servings
  • Total time: 55min (20min active)
  • Difficulty: Easy
  • Cuisine: Spanish
  • Allergens:
    Fish
Beginner friendly One pot Kid friendly

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