Fish Tagine with Chermoula — Hout M'chermel

Ingredients

• For the fish
• 1.2 kg firm white-fleshed fish — sea bass, grouper, or monkfish, bone-in steaks or sections, not fillets
• For the green chermoula
• 4 cloves garlic, crushed to a paste
• 30 g fresh coriander, finely chopped
• 1 tsp ground cumin
• 1 tsp sweet paprika
• 1 preserved lemon, rind only, finely chopped
• 60 ml olive oil
• 30 ml lemon juice, freshly squeezed
• For the tagine base
• 500 g waxy potato, peeled, sliced 5 mm thick
• 400 g tomato, sliced
• To finish
• 80 g green or violet olives
• 1 preserved lemon, quartered

Method

1. 1
   Combine garlic, coriander, cumin, paprika, chopped preserved lemon rind, olive oil, and lemon juice in a bowl and mix until homogeneous — this is the chermoula, and the olive oil is what carries the fat-soluble spice flavour into the fish during the marinade. Work the paste until you can no longer distinguish individual ingredients; a rough chermoula will give you uneven seasoning in the finished dish.
2. 2
   Coat the fish pieces thoroughly in two-thirds of the chermoula, cover, and refrigerate for a full 60 minutes — not less, so the marinade moves beyond the surface and into the flesh itself, which you will see as the colour deepening inward and the aroma shifting from sharp to rounded. At 30 minutes the chermoula is a surface coating only; at 60 minutes it has penetrated structurally and the fish will hold its seasoning through the heat of the braise.
3. 3
   Arrange the potato slices in a single overlapping layer across the entire base of the tagine, then lay the tomato slices over the potato, so this bed lifts the fish clear of direct contact with the hot clay and acts as a living sponge for the chermoula-fish juices that will fall during braising. A complete, even layer matters here — any gap exposes the fish to scorching on the clay base.
4. 4
   Lay the marinated fish pieces on top of the vegetable layer, spoon the remaining chermoula over the fish, scatter the olives across the surface, and arrange the preserved lemon quarters on top. Cover with the tagine lid, because the fish will cook entirely by the steam that the tagine's condensation cycle generates — it must not be submerged in added liquid, which would wash away the chermoula and stew rather than braise.
5. 5
   This is where the dish lives or dies: place the tagine over a diffuser on a medium-low flame, braise covered and undisturbed for 20 minutes, then press a thick probe or skewer into the deepest part of the fish — it should yield with faint resistance, the flesh just beginning to release from the bone, at which point you remove it from the heat immediately so the residual warmth inside the closed tagine carries the fish to the finish over the next 3–5 minutes. White fish in a closed tagine moves from perfect to dry within a 5-minute window, and there is no recovery from overcooked white fish; total braising time should not exceed 30 minutes.
6. 6
   Bring the tagine to the table lidded and lift the lid at the table so the steam carries the scent of coriander, cumin, and preserved lemon sharply upward. The fish should be opaque throughout, the potato base tender and deeply coloured with the braising juices.