Slimming World Portuguese Fish Stew: Easy One-Pot Recipe

This Portuguese-style fish stew combines flaky white fish, potatoes, peppers and tomatoes in a gently spiced broth. Inspired by caldeirada, a family of Portuguese fish stews with many regional and household variations, it is a hearty one-pot meal with straightforward ingredients and measured oil.

This is a Slimming World-style recipe, not an official plan calculation: ingredient allowances and the treatment of items such as oil can vary, so check your current plan guidance if you track them. The broth gets its flavour from vegetables, paprika and fish rather than a heavy sauce, and the potatoes make the stew satisfying enough to serve on its own.

Ingredients

1 teaspoon olive oil (5 ml)
1 medium yellow onion, thinly sliced (about 5 oz / 140 g)
1 red bell pepper, deseeded and sliced (about 6 oz / 170 g)
1 green bell pepper, deseeded and sliced (about 6 oz / 170 g)
3 garlic cloves, finely chopped (about 1 tablespoon / 9 g)
1½ pounds waxy potatoes, such as Yukon Gold or red potatoes, cut into ½-inch (1.25 cm) slices (680 g)
1 teaspoon sweet paprika (2 g)
½ teaspoon smoked paprika (1 g), optional
1 bay leaf
1 can chopped tomatoes, with their juice (14½ oz / 411 g)
2 cups low-sodium fish stock or vegetable stock (475 ml)
½ teaspoon fine salt, plus more to taste (3 g)
¼ teaspoon freshly ground black pepper (0.5 g)
1½ pounds firm white fish, such as cod, haddock or pollock, cut into 1½-inch (4 cm) pieces (680 g)
2 tablespoons chopped fresh flat-leaf parsley (8 g)
1 tablespoon lemon juice (15 ml), plus lemon wedges for serving

Instructions

Prepare the ingredients. Slice the onion and peppers, chop the garlic, and cut the potatoes and fish into the sizes listed. Keep the fish refrigerated while you start the stew. If your fish has skin, remove it or ask the fish counter to do so; small bones are easier to spot before cooking. Pat the pieces dry with paper towels so they are easier to handle and season evenly.
Soften the vegetables. Warm the olive oil in a large, heavy-based pot or Dutch oven over medium heat. Add the onion and both peppers and cook for 6 minutes, stirring occasionally, until softened but not browned. Add the garlic and cook for 1 minute, stirring so it does not catch. If the vegetables begin sticking, add a tablespoon or two of the measured stock rather than extra oil.
Build the tomato broth. Stir in the sweet paprika, smoked paprika if using, bay leaf, salt and black pepper. Cook for about 30 seconds, just until fragrant. Add the chopped tomatoes and stock, then stir and scrape the bottom of the pot to loosen any flavourful browned bits. Bring the liquid to a gentle boil; avoid a hard boil, which can make the potatoes break apart later.
Cook the potatoes. Add the potato slices and turn them carefully so they are covered as much as possible by the broth. Reduce the heat to maintain a steady simmer, cover the pot with its lid slightly ajar, and cook for 18 minutes. Stir once gently around the halfway point. The potatoes should be nearly tender when pierced with a small knife, but they should still hold their shape. If the liquid is bubbling too vigorously, lower the heat.
Add and cook the fish. Nestle the fish pieces among the potatoes, spooning a little broth over the top. Cover the pot and simmer gently for 10 minutes without stirring vigorously; moving the fish too much can break it into flakes. Check the thickest piece with a food thermometer. The USDA FSIS safe minimum internal temperature for fish is 145°F (63°C). If it has not reached that temperature, continue cooking and check again. The fish should look opaque and separate easily into flakes, but the thermometer reading is the safety check.
Finish and serve. Turn off the heat and gently stir in the parsley and lemon juice. Taste the broth and add a little more salt, pepper or lemon if needed. Lift the bay leaf out before serving. Let the pot stand for 2 minutes so the broth settles, then ladle the stew into warm bowls, making sure each serving gets fish, potatoes and plenty of vegetables.

Tips

Choose fish that holds together. Cod, haddock, pollock and hake are practical choices. Avoid very thin fillets, which can overcook before the potatoes are ready. Frozen fish is fine if it has been thawed safely in the refrigerator and patted dry; add it only after thawing, not as a frozen block, so the stew heats evenly.
Cut potatoes evenly. Similar-sized slices cook at a similar rate. Waxy or all-purpose potatoes tend to keep their shape better than very floury baking potatoes. If you only have a floury variety, cut slightly thicker slices and stir as little as possible.
Keep the simmer gentle. A rolling boil can make fish disintegrate and potatoes crumble. Once the potatoes are in, adjust the burner so small bubbles rise steadily around the edge of the pot. If the broth reduces too much, add a splash of stock or water.
Season in stages. Stock and canned tomatoes vary in saltiness, so begin with the listed amount and taste only after the stew has cooked. Lemon at the end brightens the tomato broth; add it gradually, since too much can make the stew taste sharp.

Serving Suggestions

Serve the stew in deep bowls with lemon wedges and extra chopped parsley. It is a complete meal as written, with fish, potatoes and vegetables in each portion. For a larger table, offer crusty bread for dipping, a simple green salad dressed with vinegar, or steamed greens such as kale or green beans. If you are following a specific eating plan, check how bread, added oil or other sides fit your own allowance rather than assuming the recipe has a particular official classification.

Keep the accompaniments uncomplicated so the paprika-tomato broth remains the focus. A small bowl of olives or sliced cucumber can make a useful starter, while a crisp, non-alcoholic drink such as sparkling water with lemon works well alongside the stew. For serving guests, put the pot on the table and use a wide spoon so the fish and potato slices can be lifted without breaking them.

Variations

Use another firm fish. Hake, pollock, monkfish or sea bass can stand in for cod or haddock. Monkfish is particularly firm and will keep distinct pieces, while a delicate fish may flake more readily. Cooking time depends on the thickness of the pieces, so use the thermometer rather than relying on appearance alone.

Add shellfish. For a mixed-seafood version, replace about 8 ounces (225 g) of the white fish with peeled raw shrimp. Add the shrimp during the final few minutes and cook until opaque and firm, while also checking that the stew reaches the fish safety temperature. If using mussels or clams, add only live, intact shellfish and cook until the shells open; discard any that remain closed. This changes the texture and gives the broth a more pronounced sea flavour.

Make the broth more rustic. Add ½ teaspoon (1 g) of ground cumin or a pinch of hot paprika with the sweet paprika. These are optional accents, not essential ingredients; use a small amount so they do not overwhelm the fish. For a less spicy pot, leave out the smoked or hot paprika and use sweet paprika alone.

Adjust the vegetables. A small sliced fennel bulb can replace one pepper for a gentle anise note, or add a handful of sliced zucchini during the last 8 minutes so it does not turn mushy. If fresh tomatoes are in season, use about 2 cups (300 g) chopped ripe tomatoes in place of the canned tomatoes; the broth may be less concentrated, so taste and adjust the seasoning at the end.

Storage and Reheating

Cool leftovers promptly and refrigerate them within 2 hours of cooking in a shallow, airtight container. Keep the stew refrigerated for 3–4 days. Fish can become a little firmer and more fragile after storage, so portion it gently and avoid repeatedly warming and cooling the whole pot.

Reheat only the portion you plan to eat, either in a covered saucepan over low to medium heat or in the microwave. Stir the broth carefully and heat until steaming throughout; leftovers should reach 165°F (74°C), checked with a food thermometer, for safe reheating. Add a splash of water or stock if the potatoes have absorbed much of the broth. Do not bring the stew to a vigorous boil, which can break up the fish. For longer storage, freeze in a suitable airtight container for up to 2 months for best quality; thaw in the refrigerator before reheating. The potatoes may soften after freezing, but the stew remains usable.

Frequently Asked Questions

What fish works best in Portuguese fish stew?

Choose a firm or moderately firm white fish that can be cut into generous pieces, such as cod, haddock, pollock or hake. Fresh or properly thawed frozen fish both work. Very thin fillets are more likely to fall apart, so add thicker pieces and handle them gently. Whatever fish you choose, check its thickest part with a thermometer and cook it to 145°F (63°C).

Can I make the stew without fish stock?

Yes. Low-sodium vegetable stock is a practical substitute and keeps the broth lighter in flavour. Water can also be used, though the result will taste less savoury; add it with the tomatoes and taste the finished broth before adjusting the seasoning. If using a salty stock cube, follow its dilution directions and reduce the added salt until you have tasted the stew.

Can I prepare Portuguese fish stew ahead of time?

You can prepare the onion, peppers, garlic and potatoes in advance, and you can cook the tomato-and-potato base earlier in the day. For the best fish texture, refrigerate the base promptly and add the fish when you reheat it for serving, cooking it until it reaches 145°F (63°C). If the complete stew is already cooked, refrigerate it within 2 hours and reheat leftovers to 165°F (74°C).

How can I tell when the potatoes are done?

Slide the tip of a small knife into a potato slice. It should pass through with little resistance, while the slice stays intact when lifted. If the potato is still firm after 18 minutes, simmer the broth for a few more minutes before adding the fish. This keeps the fish from having to cook while the potatoes catch up.

Why did my fish break apart in the pot?

Fish can break up if it is cut too small, stirred vigorously or cooked at a hard boil. Use pieces around 1½ inches (4 cm), place them between the potatoes, and keep the broth at a gentle simmer. A few flakes in the broth are normal and add flavour; serve with a ladle rather than stirring the pot repeatedly.

Is this an official Slimming World recipe?

No. It is a home-style recipe framed around measured oil and everyday ingredients, not an official Slimming World calculation or endorsement. Plan rules, allowances and ingredient classifications can change, so use your current materials or adviser for any values you need to track. The stew can be made with the same method even if you choose to adjust the oil or sides.

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Safety notes: safe minimum internal temperatures from USDA FSIS; raw and undercooked fish guidance from the U.S. FDA. Food safety notes

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