RecipesFish and Seafood

R027

Ayala Varuthathu, Baked

Mackerel with a chilli-masala rub, in a very hot oven

High ProteinLow Sat FatUnder 250 Kcal
Kerala fish curry

Photograph: Adobe Stock · representative of the dish

YieldServes 4
Active15 minutes
Total45 minutes
DifficultyEasy

Plan ahead: including 20 minutes marinating — required.

The re-engineeringThe frying oil is gone. What replaces it is 220°C (425°F), a wire rack, and 10 g of oil brushed on rather than poured in — 173 kcal a portion against 235 for the fried original, with 3 g of saturated fat instead of 9.

Read R028 immediately after this one. The two recipes are the same fish and the same rub, cooked two ways and measured both times, and they are printed side by side because a health cookbook that quietly deletes the fried version has told you a lie by omission. This one is genuinely good: the rub sets into a dark crust, the skin blisters and pulls back, and mackerel is oily enough that a hot oven treats it kindly. It is not a fried fish, and this recipe will not pretend it is.

Before you start: Get the oven fully to 220°C (425°F) with the tray and rack inside. A cold rack is how the skin sticks and tears.

Ayala Varuthathu, Baked

Active 15 minutes Total 45 minutes
Scale 4 servings

Ingredients — tap to tick off

  • 4 mackerel, about 200 g each cleaned (about 550 g edible flesh), heads on, scored 3 times a side to the bone
  • 14 g (2 tbsp) M05 fish masala
  • 8 g (a 1.5 cm piece) ginger, grated
  • 5 g (1½ cloves) garlic, crushed
  • 10 ml (2 tsp) lime juice
  • 3 g (½ tsp) M07 salt, or plain salt
  • 10 g (2 tsp) coconut oil, for brushing

Allergens: Fish. Gluten (wheat) — only if your asafoetida is compounded with wheat flour, as most brands are (it arrives with M05).

Equipment: Oven; wire rack set over a lined baking tray; silicone brush. Substitute: an air fryer at 200°C (390°F) for 10–12 minutes a side, which works very well and browns harder. A grill or broiler works too, 8–10 cm from the element, but watch it — the rub burns before the fish is done. No rack: score the tray with a bed of thin onion rings and sit the fish on that.

Per serving (estimated)

Energy173 kcal
Protein30 g
Fibre1 g
Net carbohydrate2 g
Total carbohydrate3 g
Sugars0 g
Fat5 g
Saturated fat3 g
Sodium330 mg

From ICMR-NIN IFCT 2017 and USDA FoodData Central. Per-serving figures stay the same when you scale.

Method — tap a step to mark it done, tap a time to start a timer

  1. Score each fish three times a side, cutting down to the bone at a 45-degree angle. This is not decoration: it is how the rub reaches the middle and how the thick part cooks in the same time as the thin.
  2. Mix the M05, ginger, garlic, lime juice and salt into a thick paste, adding water 5 ml at a time only if it will not spread — it should be the consistency of soft mud, not of sauce.
  3. Rub the paste over both sides and into every score and the belly cavity, working it in with your fingers. Rest at room temperature, or up to in the fridge. Longer than that and the lime starts to make the surface mealy.
  4. Brush the fish with the coconut oil, 2–3 g per fish, on both sides. A brush puts oil on the surface; pouring puts most of it into the fish and the rest on the tray.
  5. Lay the fish on the hot rack, not touching, and roast .
  6. Turn once, carefully, with a fish slice and a hand, and roast a further . It is done when the rub has darkened to near-black at the edges of the scores, the skin has blistered and shrunk back, and the flesh at the thickest part lifts from the backbone in one piece and looks opaque right through. Total .
  7. Rest on the rack before moving it. Squeeze more lime over at the table, not before.
Why this worksAt 220°C (425°F) the surface dehydrates fast enough for Maillard browning between the rub's spice sugars and amino acids and the fish's own surface protein, which is what produces the dark crust a fried fish gets from the oil. The rack matters: it lets the underside dry and brown instead of sitting in released liquid and steaming. What is genuinely lost is the crisp, oil-saturated shell that only frying produces.
Sourcing note

Indian mackerel (Rastrelliger kanagurta) is a smaller, leaner fish than Atlantic mackerel and is the species behind the numbers in this chapter. In the US: Indian mackerel frozen whole in Asian groceries; Boston or Atlantic mackerel fresh, which is fattier and needs 2–3 minutes less. In the UK: Atlantic mackerel is on every fishmonger's slab and is one of the best-value fish in the country; Indian mackerel frozen in Sri Lankan and Kerala shops. In the Gulf: bathi is Indian mackerel and chanad is the larger seer. In Australia: blue mackerel or slimy mackerel, both cheap and both correct. Frozen mackerel is a real compromise here, because thawed flesh sheds water onto the tray and steams rather than roasts — if you must, thaw in the fridge, then pat dry hard and marinate for only 10 minutes.

If you are watching…

Blood sugar: 2 g of net carbohydrate. Nothing here moves glucose; 30 g of protein moves satiety a great deal.

Blood pressure: 330 mg, most of it the added salt. Two grams instead of three lands at about 260 mg — do it, because the rub is intense enough to carry the loss.

Cholesterol: 3 g of saturated fat per serving, of which about 2 g is the brushed coconut oil. Brush with sesame or groundnut instead and it falls below 2 g.

Swap it

No mackerel → sardine, which is oilier and needs 4–5 minutes less; or pomfret, which is leaner and wants an extra 2 g of brushed oil.

Fillets instead of whole fish → 130 g per person, skin side up, 9–12 minutes total, no turning. Faster and easier and considerably less good, because the bone and the belly fat are half of why this works.

M05 → 8 g Kashmiri chilli powder, 3 g pepper, 2 g turmeric and a pinch of fenugreek. See the fenugreek note at R024 SWAP IT if you take insulin or a sulfonylurea.

Coconut oil → sesame or groundnut. Saturated fat drops by about 1.5 g per serving; the aroma changes noticeably and it is still a good fish. (Allergen: this swap introduces peanuts, sesame.)

Scale it

Eight fish need two trays and two racks, or two batches; a crowded oven steams rather than roasts.

Make ahead · store · freeze

Rub the fish and hold it. Fridge 24 hours rubbed and uncooked, which improves it. Cooked: fridge 2 days. Freeze 1 month rubbed and raw, thawed overnight in the fridge; do not freeze it cooked, because reheating a baked oily fish is a poor experience. Reheat in a 200°C (390°F) oven for 5–6 minutes, never a microwave.

Leftovers

Flake it, bones out, into a peera with 40 g grated coconut (see R031 for the method), or into a cutlet mix (R039). Cold baked mackerel with lime and raw onion on matta rice is a better lunch than it sounds.

Troubleshooting

Rub slid off in the oven: the paste was too wet, or the fish was not patted dry before rubbing. Thicker paste, drier fish.

Skin stuck to the rack and tore: the rack was cold, or unoiled, or the fish was moved too early. Hot rack, brushed rack, and let it release itself.

Dry and cottony: overcooked, which happens in the last three minutes. Pull it when the thickest part has just gone opaque.

Pale and steamed rather than roasted: the oven was not fully up to temperature, the fish were touching, or they were still wet from thawing.

Serve with
R015 Matta Rice · R081 Moru Curry · R063 Cabbage Thoran · R053 Vanpayar Thoran

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