Why Foil-Wrapped Fish Deserves a Place by the Fire

Cooking in foil is the quiet hero of fireside suppers. It asks for no pans, no grill basket and almost no washing up, and it forgives the sort of vague timing that real fires demand. A sealed parcel traps steam and scent together, so the fish steams gently in its own juices while the lemon and herbs do their work. The result is reliably moist, faintly smoky, and fragrant enough to make people wander over and ask what is in the foil.

It is also a forgiving way to cook over embers, whether you are at the bottom of a garden, on a campsite or on a beach where fires are permitted. Learn the parcel once and you can cook mackerel on a Cornish beach, sea bass in a Herefordshire orchard, or trout beside a Scottish loch with the same handful of ingredients.

Choosing and Preparing Your Fish

Allow roughly 400–500g of whole fish per person, or 150–200g of fillet. Sea bass, bream, mackerel, trout, pollack and small cod all work beautifully. Ask your fishmonger to gut and scale it, and to leave the head on if you can bear it — the cheeks are the sweetest mouthful and the head keeps the shape of the parcel.

At the fire, rinse the fish in cold water and dry it thoroughly with kitchen paper, inside and out. This matters more than people expect: a wet fish turns to steam-logged mush. Score the flanks of a whole fish two or three times through the thickest part with a sharp knife, cutting down to the bone, so the heat and the butter reach the middle.

• Whole fish: 400–500g each, scored on both sides
• Fillets: skin on, pin-boned, patted dry
• Foil: a 45cm sheet, doubled for extra insurance; heavy-duty if you have it

Lemon, Herbs and the Knob of Butter

Lay the doubled foil on a flat surface and build a little bed: three or four thin slices of lemon, a handful of herbs, a scattering of sea salt and black pepper. Sit the fish on top. Push more herbs and lemon into the cavity, then lay two or three cold knobs of butter along the top of the fish — about 25–30g in total. A splash of white wine, cider or even a spoonful of water adds a little extra steam.

Some pairings that never disappoint:

• Mackerel: dill, lemon, a pinch of fennel seed
• Sea bass: thyme, bay, sliced fennel bulb, butter
• Trout: parsley, lemon, a few flaked almonds
• Bream: rosemary, garlic, orange instead of lemon

Now seal it well. Bring the two long edges of foil together above the fish, fold them over twice to make a tight crimp, then roll the two ends inwards like a pasty, leaving a little slack in the top so the steam can swell the parcel. A loose seal simply dries the fish out; a good one puffs up like a pillow.

Embers, Not Flames

The single most common mistake is cooking over fire rather than embers. Let your fire burn down for 30–45 minutes until the wood has collapsed into grey ash with a deep red glow beneath. Rake that into a flat bed about 10cm deep, or push it to one side of the pit and cook over the raked coals.

Set the parcels directly on the embers, or on a grill grate just above them. You should hear a soft hiss and a faint crackle within a minute; violent spitting or a lick of flame means the spot is too hot, so move the parcel aside and let that patch calm down.

• Fillets: 6–8 minutes a side
• Whole fish up to 500g: 8–10 minutes a side
• Larger whole fish: 12–15 minutes a side, turned once with tongs

Telling When It Is Done

Timings are a guide, not a rule, because embers vary from fire to fire. Open a corner of the parcel after the shortest time — always tilting it away from your face, as the steam is ferocious. The flesh at the thickest point should be opaque and flake easily under a fork, and the eye of a whole fish should be white and set rather than glassy. If the flesh still clings and looks translucent, reseal the foil and give it another three minutes.

Let the parcel rest for two minutes before you open it properly, then eat straight from the foil with bread, a sharp green salad and a squeeze of the remaining lemon. Everything tastes better with slightly burnt fingers and a bit of woodsmoke in your hair.

The Waiting Hour: Stories for the Embers

Embers demand patience, and patience has always been filled with stories. In Ireland the tale of the Salmon of Knowledge turns on a boy who burned his thumb on a cooking fish and, sucking the burn, swallowed the wisdom meant for his master. Along the northern coasts, selkie stories were told while the catch was cleaned — seals who shed their skins and walked on land, and men foolish enough to hide the skin. Cornish firesides had the mermaid of Zennor, who followed a church singer down to the sea and was never seen in the pews again.

Fishermen's families carried their own small rules: certain words were never spoken at sea, certain names never given to the boats, and the first fish of a catch was often given away rather than sold. You need not believe any of it to enjoy it. While the parcels sit hissing on the coals, hand the storytelling to whoever is nearest the fire and let them take ten minutes. A tale told over a cooking fish is the oldest kind of supper entertainment there is — and the fish, ready or not, will tell you when it is time to eat.