Bouillabaisse with Rouille (Bouillabaisse Marseillaise)

// SUPPLY LIST

// OPERATIONS

1. 1 Set a wide 8-10 litre stainless-steel or enamelled stockpot over medium-low heat and warm 150 ml of the olive oil. Add the sliced onion, leek and fennel with the 8 crushed garlic cloves and a good pinch of fine salt, and sweat, stirring every couple of minutes, for 12-15 minutes, until everything is soft, translucent and collapsed but has taken no colour at all — the moment the onion browns the broth turns sweet and muddy instead of clean and marine. Stir in the fennel seeds and the quartered tomatoes, raise the heat to medium and cook 8-10 minutes more, until the tomatoes have fallen apart and the oil at the edge of the pan runs bright orange.
2. 2 Add the rock fish whole — heads, bones and all — and stir over medium-high heat for 4-5 minutes, pressing them against the side of the pot with a wooden spoon, until the flesh whitens and begins to come away from the frames.
3. 3 Pour over the 3 litres of boiling water. It must be boiling, not cold: water at 100°C/212°F starts the emulsion the instant it hits the oil, while cold water leaches the bones slowly and leaves you with a grey, thin broth. Add the bouquet garni, bring back to a full rolling boil and boil uncovered, hard enough that the surface heaves and never settles, for 20 minutes; a lazy simmer here is the single most common way home bouillabaisse fails, and going much past 30 minutes turns the bones bitter.
4. 4 Fish out and discard the bouquet garni, then pass everything else — fish, heads, bones, vegetables and liquid — through a food mill (moulin à légumes) fitted with the medium plate, working in batches and cranking backwards and forwards until only dry bone and skin stays behind. Push the milled soup through a fine chinois with the back of a ladle, pressing hard. With no food mill, pulse it in a blender in five-second bursts for no more than 20 seconds in total before sieving — blend it longer and the pulverised pin bones turn the soup gritty and faintly bitter, and nothing will undo that.
5. 5 Measure the broth: you want 2.4-2.6 litres, so boil it down or top it up with water accordingly, then return it to a clean pot of at least 6 litres and no less than 30 cm across — you need that width to take the fish in a single layer later, and the headroom so it does not climb out when you take it to a violent boil. Crumble three-quarters of the saffron into a small bowl with 100 ml of the hot broth and leave it to bloom for 20 minutes — dry saffron thrown in at the end colours but does not flavour — then stir it in with its liquid along with the dried orange peel. Salt to about 9 g per litre, roughly 22 g in all, and stop there: the broth still has to reduce through the potatoes, the emulsion boil and the fish, and the table fish is salted separately, so a broth seasoned to taste now will drink salty by the time it reaches the plate. Cover, take off the heat and leave to infuse for at least 1 hour, or cool and refrigerate overnight, which is better. No wine, no fish stock, no cream ever goes in — Marseille broth is rock fish, olive oil, vegetables and water.
6. 6 While the broth rests, heat the oven to 150°C/300°F and lay the baguette slices in a single layer on a wire rack set over a baking tray. Dry them for 18-20 minutes, turning once, until they snap cleanly and are crisp right through to the centre but barely blond — this is drying, not toasting, and in a hotter oven they colour before the middle dries, leaving croûtes that go bitter under the rouille or soften and dissolve in the broth. Rub one face of each while still hot with the cut side of the halved garlic cloves. At the same time, scatter about 10 g fine sea salt evenly over all the pieces of table fish and return them to the fridge for 30 minutes, which firms the flesh so it does not shred in the boil; keep it to that light dusting, because the fish finishes in already-salted broth. Take the egg yolk out of the fridge now so it comes to room temperature — a fridge-cold yolk is the commonest reason a rouille splits.
7. 7 Bring the broth back to a full rolling boil over high heat, add the potato rounds and boil steadily, uncovered, for 12-14 minutes, until the tip of a knife slides through without resistance while the slices still hold their shape and the edges have not begun to fray. Top up with a splash of boiling water, never cold, if the level drops much below where it started. Lift out one slice for the rouille, then lift the rest out with a slotted spoon and keep them warm in a ladleful of broth.
8. 8 Start the rouille in a mortar while that potato is still hot: pound the 4 degermed garlic cloves with the 1/2 tsp coarse salt for a full 2 minutes, until you have a completely smooth ivory paste with no visible fragments, then work in the cayenne and the reserved saffron first pounded with 1 tbsp of hot broth. Crush in the hot potato slice, then beat in the room-temperature egg yolk until the paste is thick and glossy — a hot potato or a crustless slice of bread soaked in broth is the traditional Marseille binder and the yolk is the home cook's insurance, and using both gives a rouille that will not break on the way to the table.
9. 9 Now add the 150 ml rouille oil drop by drop for the first 50 ml, stirring steadily in one direction with the pestle, then in a thin thread until it is all in and the sauce holds the mark of the pestle; loosen with 1-2 tbsp hot broth to the consistency of a thick mayonnaise. A cold yolk or oil added too fast will split it — if it breaks, beat a fresh yolk in a clean bowl and add the broken sauce back to it a teaspoon at a time. Pounding by hand you can use all fruity Provençal oil; in a food processor use half mild oil instead, because the blades shear strong Provençal oil and turn it acrid, which a pestle does not.
10. 10 Bring the broth to a violent rolling boil over your highest heat — the surface should be churning, not merely bubbling — and pour in the remaining 150 ml olive oil in a steady thread down the inside of the pot over about a minute, keeping the boil at full tilt. Within 2-3 minutes the slick on the surface disappears and the broth turns opaque and pale rust-orange, like thin cream: that is the emulsion, and it is the whole point of the dish. If oil is still floating, the heat is too low — this is the one soup in the French repertoire that must be boiled hard, and gentleness here leaves you with fish-flavoured water under a greasy film.
11. 11 Keeping the pot at that full boil, slide in the densest fish first — the conger eel and monkfish sections — and boil hard for 4 minutes, then add the rascasse, gurnard and John Dory in a single layer and boil a further 5-6 minutes. They are ready when the flesh at the thickest point parts cleanly from the bone under a fingertip and is opaque white right down to the spine, and the eyes of any whole fish have turned white and domed; two minutes past that and the rascasse falls to threads.
12. 12 Take the pot off the heat and let it stand uncovered for 3-4 minutes, then lift the fish out with a spider onto a warmed deep platter, add the drained potatoes and moisten with two ladles of broth so nothing dries out. Fish out and discard the orange peel and taste the broth for salt only now that it has finished reducing, adding the last of it a pinch at a time; it should coat the back of a spoon in a thin, even film. If it has slackened while it stood and a film of oil has come back to the surface, return it to the highest heat for 30 seconds at a hard boil and it will pull straight back together.
13. 13 Serve in the traditional two services, and warm the soup plates and the platter first — cold china flattens this soup faster than any other fault. First the broth, poured hot into the warmed plates, with the garlic croûtes and the bowl of rouille passed round so each person spreads a croûte thickly and floats it, the rouille dissolving in and thickening the soup as it goes. Then the platter of fish and potatoes, scattered with the reserved chopped parsley and fennel fronds, with more croûtes and a ladle of broth over each serving. Drink a cold Cassis blanc or a Bandol rosé with it, and note that grated gruyère belongs to soupe de poissons, not to bouillabaisse — in Marseille it does not come to the table.

// CLASSIFICATIONS