If you’ve watched my Soupe de Poisson video, you already know I like a soup that tastes like the sea: deep, aromatic, and strong enough to stand up to rouille, garlic croutons, and a shower of cheese. Since publishing that video, I’ve made a few changes to make the recipe more consistent at home (and easier to write down with reliable proportions). The big one: I shorten the fish-stock simmer so it stays clean and sweet, then I build intensity with a controlled reduction and the final soup simmer.

This is the kind of recipe you make when you want something comforting in the winter, but still “bistro-level.” It’s also a great way to turn fish frames, heads, and bones into something you’ll be proud to serve.

If you like fish nights, you’ll probably also enjoy my ultra-crispy beer battered fish and chips (perfect pairing on a different day) here: https://www.micheldumas.com/en/ultra-crispy-beer-battered-fish-and-chips-complete-recipe-chef-tips/

What makes this fish soup different

Real fish stock (not just water + seafood bouillon).
Fennel + saffron + paprika for that classic southern-French vibe, without losing the clean taste of the fish.
A rouille “my way” (egg + mustard + harissa) that’s bold, stable, and fast.
Blending guidance so you don’t end up with gluey soup or a bitter aftertaste.

For another recipe where stock technique really matters, my beurre manié guide is useful when you want to adjust texture at the end: https://www.micheldumas.com/en/beurre-manie-recipe/

Ingredients (Imperial only)

Fish Stock (for the soup base)

3 to 4 lb fish frames/heads/bones (white fish: cod, haddock, sea bream, snapper, etc.)
1 large onion, quartered
2 medium carrots, chopped
1 fennel bulb, chopped (fronds included if you have them)
2 bay leaves
4 to 6 sprigs thyme
1 small handful basil (or parsley if that’s what you have)
10 black peppercorns (optional)
1 1/2 tsp kosher salt (light seasoning only)
Cold water (about 10 to 12 cups, enough to cover)

The Soup

1 1/2 lb cod fillets (or another firm white fish), cut in large chunks
2 tbsp olive oil
1 onion, chopped
1 carrot, chopped
1 fennel bulb, chopped
3 to 4 garlic cloves, chopped
1/2 cup dry white wine (optional but recommended)
1 1/2 cups crushed tomatoes (for color + balance)
1 tsp ground cumin
1 tsp paprika
1/2 tsp chili powder (or to taste)
1 pinch saffron threads (about 1/2 tsp threads)
1 tbsp hot water (to bloom saffron)
Salt + black pepper, to taste
1 to 2 tsp lemon juice or a small splash of vinegar (finishing acid)

Croutons + Cheese

1 baguette, sliced
1 garlic clove (for rubbing)
Grated Gruyère (or Swiss-style cheese), for serving
Fresh basil leaves, optional

Rouille (my quick version)

1 large egg
1 tbsp vinegar
1 tbsp Dijon mustard
1 tbsp harissa (more or less to taste)
1 small garlic clove
1 cup neutral oil (or half olive oil / half neutral)
Salt + black pepper

If you want a homemade harissa, see: https://www.micheldumas.com/en/homemade-harissa-paste/
And for mayonnaise technique, this one is a great reference: https://www.micheldumas.com/en/homemade-mayonnaise-recipe-easy-failproof/

Step-by-step

1) Make a clean, powerful fish stock (shorter simmer, better flavor)

Add onion, carrots, fennel, bay, thyme, basil, and fish frames/heads to a large pot.
Cover with cold water (about 10–12 cups). Add a light amount of salt.
Bring to a gentle simmer. As soon as it starts bubbling, skim the foam.
Keep it at a bare simmer (not a hard boil) for 60 to 90 minutes.
Strain. If you want more strength, reduce the strained stock by 15–25 minutes instead of simmering the bones for 3 hours.

Why the change from my video: a very long fish simmer can pull bitterness from heads/bones. A shorter stock stays clean, then reduction gives you the punch.

2) Build the soup base

Bloom saffron: mix saffron threads with 1 tbsp hot water and let sit 10 minutes.
In a heavy pot, heat olive oil. Add onion, carrot, fennel, and garlic.
Cook 8–10 minutes until lightly golden.
Add the fish chunks, season lightly, and stir for 1 minute.
Deglaze with white wine (optional), let it reduce for 1 minute.
Add crushed tomatoes, paprika, cumin, chili powder, and the bloomed saffron.
Add fish stock to cover by about 1 inch (usually 6–8 cups).
Simmer gently for 45 to 60 minutes.

3) Blend to the right texture (don’t overdo it)

Turn off heat and blend with an immersion blender until smooth but not gluey.
If it feels too thick, add a splash of stock or hot water.
If it feels too thin, simmer 5–10 minutes uncovered.

Finish with lemon juice or a small splash of vinegar. This is the difference between “good” and “restaurant-level.”

For another soup night, my Potage Parmentier is a classic: https://www.micheldumas.com/en/potage-parmentier-soup/

4) Make the croutons

Slice baguette and toast under the broiler until crisp.
Rub with a garlic clove.

If you want a dedicated guide, my garlic croutons recipe is here: https://www.micheldumas.com/en/homemade-garlic-croutons/

5) Make the rouille (fast, stable, spicy)

Add egg, vinegar, mustard, harissa, garlic, salt, and pepper to a tall cup.
Blend with an immersion blender.
Slowly stream in oil until thick and emulsified.
Chill.

Substitutions

Fish for the soup: cod, haddock, pollock, halibut, even monkfish (expensive but amazing).
Fish frames: ask your fishmonger for bones/heads (often cheap or free). If you can’t find them, use shrimp shells + a little white fish, but keep simmer short.
Saffron: it’s unique, but you can still make a great soup without it—use more fennel + paprika.
Tomatoes: crushed tomatoes are easiest; tomato paste works too (2 tbsp) with extra stock.
Harissa: adjust heat or swap with a little chili + smoked paprika. Homemade harissa option: https://www.micheldumas.com/en/homemade-harissa-paste/

FAQ

Can I make this fish soup ahead?

Yes. The soup tastes even better the next day. Keep rouille and croutons separate, then reheat the soup gently.

Can I freeze it?

Yes. Freeze the blended soup in airtight containers up to 2–3 months. Make fresh croutons and rouille when serving.

Why add acid at the end?

Fish stock + spices can taste heavy. A small amount of lemon/vinegar lifts everything and makes the flavors “pop.”

My soup tastes bitter—what happened?

Usually: stock simmered too long, or boiled hard. Next time keep it gentle and stop at 60–90 minutes, then reduce the strained stock if needed.

What if I don’t want to blend it?

You can keep it rustic, but blending gives the classic texture. If rustic, chop fish smaller and simmer less.

What to serve with fish soup (Suggested posts)

Homemade tartar sauce (great with seafood nights): https://www.micheldumas.com/en/homemade-tartare-sauce-recipe/
Crispy fried calamari (perfect appetizer): https://www.micheldumas.com/en/crispy-fried-calamari/
Ultra-crispy beer battered fish and chips: https://www.micheldumas.com/en/ultra-crispy-beer-battered-fish-and-chips-complete-recipe-chef-tips/
Classic French onion soup (another bistro classic): https://www.micheldumas.com/en/classic-french-onion-soup-recipe/
Creamy tomato soup (simple comfort): https://www.micheldumas.com/en/creamy-tomato-soup/
Beet-cured salmon gravlax: https://www.micheldumas.com/en/beet-cured-salmon-gravlax/
Easy homemade sweet and sour sauce (for quick weeknight contrast): https://www.micheldumas.com/en/easy-homemade-sweet-and-sour-sauce/
Homemade mayonnaise (base for sauces): https://www.micheldumas.com/en/homemade-mayonnaise-recipe-easy-failproof/
Beurre manié (for finishing sauces): https://www.micheldumas.com/en/beurre-manie-recipe/
Spaghetti al Pomodoro (30 minutes): https://www.micheldumas.com/en/spaghetti-al-pomodoro-30-minutes/

Fish Soup with Saffron Rouille (Classic French-Style, Made with Canadian Fish Stock)

If you’ve watched my Soupe de Poisson video, you already know I like a soup that tastes like the sea: deep, aromatic, and strong enough to stand up to rouille, garlic croutons, and a shower of cheese. Since publishing that video, I’ve made a few changes to make the recipe more consistent at home (and easier to write down with reliable proportions). The big one: I shorten the fish-stock simmer so it stays clean and sweet, then I build intensity with a controlled reduction and the final soup simmer.

Print The Recipe Pin The Recipe

Prep Time 25

Cooking Time 2

Category Soup

Cuisine Worldwide

Portions 6 Portions

Calories 300 kcal