Provençal Fish Stew with Rouille

Provençal Fish Stew with Rouille

This saffron fish stew has the flavours people often look for in bouillabaisse: fennel, tomato, citrus, aromatic fish broth, tender white fish, croutons, and garlicky rouille. It is designed for a practical home kitchen, with firm white fish that is easy to buy and a potato-caper rouille made with a cooked egg rather than raw yolk.

It is bouillabaisse-inspired rather than a strict Marseille bouillabaisse. The pasta and lighter rouille make it a generous, weeknight-friendly Provençal-style dinner while keeping the broth vivid and the fish at the centre of the bowl.

Why This Fish Stew Works

• Fennel, saffron, tomato, and citrus build the broth. Sweating the fennel and onion first softens their sweetness; wine, tomato, stock, saffron, and zest then create a layered broth without a long simmer.
• The fish poaches gently at the end. A hard boil toughens delicate fillets. Keeping the broth just below a simmer gives moist, large flakes in a few minutes.
• Pasta is cooked separately. It stays properly al dente and does not drink up the broth before serving. For a bread-led meal, leave it out and add extra croutons instead.
• The rouille is rich but balanced. Potato gives body, capers add briny depth, and olive oil creates a creamy sauce without the heavy oil load of a traditional raw-yolk emulsion.

Ingredients

Saffron Fish Stew Base

• 15 ml extra-virgin olive oil (1 tbsp)
• 150 g yellow onion, finely sliced
• 150 g fennel bulb, trimmed and thinly sliced
• 2 garlic cloves (about 6 g), finely chopped
• 400 g chopped tomatoes, fresh or canned
• 125 ml dry white wine (1/2 cup)
• 750 ml fish stock (3 cups)
• 15 ml pastis, optional (1 tbsp)
• 1/4 tsp saffron threads
• Finely grated zest of 1 orange
• Finely grated zest of 1 lemon
• 3 thyme sprigs
• 3/4 tsp fine sea salt, plus more to taste
• Freshly ground black pepper

Potato-Caper Rouille

• 1 medium egg
• 100 g cooked floury potato flesh
• 60 ml hot fish broth (1/4 cup), taken from the stew
• 25 g capers, drained
• 1 garlic clove, roughly chopped
• 10 g Dijon mustard (2 tsp)
• 1 pinch cayenne pepper
• 50 ml extra-virgin olive oil

Pasta, Fish, and To Serve

• 160 g dried spaghetti
• 600 g firm white fish fillets, skinless and cut into 4 portions, such as cod, haddock, hake, or halibut
• 80 g large croutons, preferably garlic-rubbed
• 10 g flat-leaf parsley, roughly chopped, optional

Method

Build the Saffron Broth

1. Heat the olive oil in a large heavy-bottomed pot over medium heat. Add the onion, fennel, and garlic with a pinch of salt. Cook for 8 to 10 minutes, stirring often, until soft and glossy but not browned.
2. Add the tomatoes and white wine. Simmer for 2 minutes, then add the fish stock, optional pastis, saffron, orange zest, lemon zest, thyme, salt, and black pepper.
3. Bring to a gentle simmer and cook uncovered for 15 minutes. Remove the thyme. Reserve 60 ml of hot broth for the rouille, then keep the remaining broth warm over low heat.

Make the Potato-Caper Rouille

1. Meanwhile, place the egg in a small saucepan of simmering water and cook for 7 minutes. Transfer it to cold water, peel, and halve it.
2. Blend the egg, potato, reserved hot broth, capers, garlic, mustard, and cayenne until smooth. With the blender running, slowly stream in the olive oil until the rouille is creamy. Taste before adding salt: capers vary in saltiness.

Cook the Pasta and Poach the Fish

1. Cook the spaghetti in a large pan of well-salted boiling water until just al dente. Drain; do not rinse.
2. Bring the saffron broth back to a bare simmer. Slide in the fish, cover, and cook for 4 to 6 minutes, depending on thickness, until opaque and just beginning to flake. Avoid stirring the pot so the fillets stay intact.

Assemble and Serve

1. Divide the spaghetti between four warm bowls. Set a piece of fish on each portion and ladle the hot broth and vegetables around it.
2. Add croutons, a spoonful of rouille, and parsley if using. Serve the remaining rouille at the table so everyone can enrich their broth to taste.

Choosing Fish for a Provençal-Style Stew

Choose firm, skinless white fish that stays in generous flakes. Cod, haddock, hake, pollock, and halibut are all practical choices. If fillets are thin, start checking after 3 minutes; fish is ready when it is opaque through the centre and separates with gentle pressure.

Avoid adding the fish while the broth is vigorously boiling. The flavour will still be good, but the texture will become dry and broken rather than tender and spoonable.

Make-Ahead and Serving Notes

Make the saffron broth up to 2 days ahead and refrigerate it in a sealed container. Make the rouille up to 1 day ahead and keep it chilled. Reheat the broth gently, then cook the pasta and fish just before serving.

Pasta makes this stew filling enough for dinner. For a simpler, more traditional-feeling bowl, replace it with more croutons or crusty bread. For another seafood dinner with bright citrus flavours, try lemon garlic shrimp with asparagus or citrus mint marinated dorade.

Common Problems

Why is my fish dry?

The broth was probably boiling too hard or the fillets were cooked for too long. Keep it at a bare simmer, cover the pot, and remove it from the heat as soon as the fish flakes.

Why does the broth taste flat?

Taste after the 15-minute simmer. A little more salt, black pepper, or lemon zest can wake it up. Stock quality matters too, so use the best fish stock available rather than plain water.

Why is my rouille too thick or split?

Blend the potato and egg mixture completely smooth before streaming in the oil. If it becomes too thick, blend in hot broth a teaspoon at a time. If it looks oily, blend in another spoonful of potato or broth to bring it back together.

FAQ

Is this a traditional bouillabaisse?

No. It takes flavour cues from bouillabaisse but uses accessible white fish, pasta, and a cooked-egg potato-caper rouille. A traditional Marseille bouillabaisse follows more specific fish choices and serving conventions.

Can I use bread instead of spaghetti?

Yes. Omit the spaghetti and use extra croutons or toasted slices of crusty bread to soak up the broth.

How long do leftovers keep?

Refrigerate leftover fish stew within 2 hours and eat within 2 days. Store pasta separately if possible. The rouille keeps for up to 1 day refrigerated because it contains cooked egg.