Mackerel with wild fennel

Ingredients

• 4, cut into 8 filletsmackerel
• 1 large (about 200 g)white onion
• 200 gyellow tomatoes, such as datterini
• 1 generous bunchwild fennel
• 20 gpine nuts
• juice of 1lemon
• to tastetoasted breadcrumbs
• 4 tablespoons (60 ml)extra-virgin olive oil
• to tastesalt
• to tasteblack pepper

Instructions

1. 1

   Prepare fennel

   Remove any damaged leaves and the thickest, toughest stems from the wild fennel. Rinse it under running water, then boil it in plenty of salted water for about 10 minutes, or until tender. Drain and immediately rinse in cold water to preserve its green colour. Chop it finely with a knife and set aside.

2. 2

   Fillet mackerel

   Slit the mackerel along the belly and remove the innards. Rinse the fish under running water, then use a sharp knife to cut it into fillets. Remove any remaining pin bones with tweezers, or ask your fishmonger to do this.

3. 3

   Prepare vegetables

   Rinse the onion and slice it thinly. Wash the tomatoes and halve them. Heat 2 tablespoons of extra-virgin olive oil in a large non-stick frying pan over a low heat. Add the onion and 1 tablespoon of water, then stir well.

4. 4

   Soften onion

   Cover the pan to retain moisture and cook gently for 5–6 minutes, stirring occasionally, until the onion is soft and translucent but not coloured. Add the yellow tomatoes and cook over a medium-low heat for 5 minutes. Meanwhile, toast the pine nuts in a small non-stick frying pan for 2–3 minutes without adding any fat.

5. 5

   Add wild fennel

   Add the chopped wild fennel to the pan with the tomatoes and softened onion, stirring to combine the flavours. Cook gently for 2–3 minutes so the fennel releases its aromatic oils while retaining its freshness.

6. 6

   Cook mackerel

   Heat the remaining 2 tablespoons of extra-virgin olive oil in another non-stick frying pan over a medium heat for 1 minute. Lay the mackerel fillets skin-side down and cook without moving them for 2 minutes, then turn them carefully with a spatula. Cook for 1 minute more, then pour over the lemon juice and season with salt and pepper.

7. 7

   Finish and serve

   Place 2 mackerel fillets on each plate and spoon some of the vegetable mixture over them. Scatter with the toasted pine nuts and finish with toasted breadcrumbs. Serve straight away.

What is mackerel with wild fennel?

This dish pairs pan-fried mackerel with wild fennel, onion and tomatoes, finished with pine nuts and breadcrumbs. It draws on the aromatic ingredients and fish cookery associated with southern Italy.

The fish’s robust flavour is balanced by soft, gently cooked vegetables, while lemon brightens the finish. Cooking the fennel first keeps it tender and lets its distinctive herbal aroma mingle with the tomato and onion.

Nutrition and macros by portion

The nutrition label shows one serving as written: 360 calories, 27g protein, 11g carbs, 24g fat.

The mackerel provides most of the protein and fat, with olive oil and pine nuts adding further fat. The tomatoes, onion and breadcrumbs supply most of the carbohydrates, though the exact balance depends on how much breadcrumb and salt you use. For a balanced plate, serve a portion with plenty of vegetables or a simple green salad.

Choosing the fish and fennel

Mackerel: Ask the fishmonger to clean and fillet the fish if you do not want to do it at home. Check each fillet for pin bones before cooking.

Wild fennel: Remove tough stems and damaged leaves before boiling. The tender leaves and finer stems carry the aromatic flavour that seasons the vegetable mixture.

Build the vegetable base gently

Soft onion: Keep the heat low and cover the pan so the onion turns translucent without browning. A tablespoon of water helps it soften while it cooks.

Yellow tomatoes: Add these after the onion has softened, then give them 5 minutes over a medium-low heat. They should warm through and begin to soften without losing all their shape.

Cook the mackerel skin-side down

Skin first: Set the fillets skin-side down in the heated oil and leave them undisturbed for 2 minutes. This gives the skin time to cook before the fish is turned.

Brief second side: Turn the fillets carefully and cook for 1 minute more, then add the lemon juice and season. The fillets are ready when the flesh is opaque and separates easily; avoid extending the cooking time unnecessarily.

Toast the finishing touches

Pine nuts: Toast them in a dry pan for 2–3 minutes, watching closely and moving them as needed so they colour evenly. Their nutty flavour adds contrast to the soft vegetables.

Breadcrumbs: Use toasted breadcrumbs for a crisp topping and add them just before serving. This helps them keep their texture against the warm fish and sauce.

Timing and serving

The wild fennel can be boiled while you prepare the fish and vegetables, and the pine nuts can toast while the tomatoes cook. Keep an eye on each pan so the onion stays pale and the nuts do not burn.

Serve the fillets straight away with the vegetable mixture spooned over them. Bread, boiled potatoes or a simple green salad make suitable accompaniments.

Recipe notes & tips

• Ask the fishmonger to fillet the mackerel and remove the pin bones if you prefer.
• Chop the boiled wild fennel finely so it distributes evenly through the vegetable mixture.
• Keep the onion covered and cook it gently to prevent it from taking on colour.
• Toast the pine nuts in a dry pan and watch them closely, as they can brown quickly.
• Let the mackerel cook skin-side down without moving it for the full 2 minutes.
• Add the breadcrumbs just before serving to preserve their crunch.

Variations

• Use red tomatoes: Replace the yellow tomatoes with the same amount of ripe red tomatoes.
• Add chilli: Sprinkle a little chilli into the onion as it softens for a warmer finish.
• Use parsley: If wild fennel is unavailable, use parsley for a different but fresh herbal note.
• Serve with potatoes: Add boiled potatoes alongside the fish to make the meal more substantial.
• Change the nuts: Use toasted chopped almonds in place of pine nuts for a different crunch.

Common mistakes to avoid

• Browning the onion: Keep the heat low and the pan covered so it softens without colouring.
• Leaving tough fennel stems in: Remove the thickest stems before boiling so the chopped fennel is tender.
• Moving the fish too soon: Leave it skin-side down for 2 minutes before turning it carefully.
• Overcooking the fillets: Follow the stated 2-minute and 1-minute cooking times, checking that the flesh is opaque.
• Burning the pine nuts: Toast them over a dry pan for 2–3 minutes and keep a close watch.
• Adding breadcrumbs too early: Sprinkle them over the plated fish just before serving so they stay crisp.

How to store

Refrigerate leftover fish and vegetables in a covered container for up to 2 days. Reheat gently in a covered pan until hot, and add fresh toasted breadcrumbs after reheating; the fish is best freshly cooked.

Frequently asked questions