Equipment
Ingredients
Main Ingredients
- 4 mackerel fillets, fresh, pin-boned, skin-on
- 3 g fine sea salt, dry
- 15 ml olive oil, liquid
- 30 ml white wine vinegar, liquid
- 10 g fresh tarragon, whole sprigs
Nutrition (per serving)
Nutrition is estimated per serving. Nutrients without complete source data are omitted.
Full nutrition
- Calories
- 216 kcal
- Protein
- 17 g
- Carbohydrates
- 0 g
- Fat
- 16 g
- Fiber
- 0 g
- Sugar
- 0 g
- Sodium
- 372 mg
- Saturated Fat
- 3 g
Sources: Aggregated Public Data, USDA FoodData Central
Method
Pick the tarragon leaves from the woody stems on a clean cutting board and finely chop the leaves with a chef's knife.
Place the mackerel fillets skin-side up on the cutting board and pat both the skin and flesh completely dry with paper towels, then immediately wash hands, board, and knife thoroughly with hot soapy water to prevent cross-contamination.
Score 3 shallow diagonal incisions across the skin of each fillet using a sharp chef's knife, piercing only the skin layer without slicing into the flesh below.
Season both the skin and flesh sides of all 4 fillets evenly with 3g of fine sea salt.
Place a heavy-bottomed frying pan over medium-high heat, add 15ml of olive oil, and heat until shimmering and faint wisps of vapor appear at 190°C (375°F).
Lay the mackerel fillets into the hot oil skin-side down, press each fillet firmly with a fish spatula for the first 30 seconds to maintain flat contact, and sear undisturbed for 3 minutes.
Turn the fillets over using the fish spatula and sear the flesh side for 1 minute until the flesh is completely opaque and an instant-read thermometer inserted into the thickest part reads at least 63°C (145°F).
Transfer the cooked fillets skin-side up onto a serving platter with the fish spatula to rest for 2 minutes.
Pour 30ml of white wine vinegar directly into the residual pan juices over medium heat, scraping up all browned bits from the pan bottom with the fish spatula for 30 seconds until slightly reduced.
Remove the pan from the heat, fold the chopped tarragon into the warm vinegar reduction, and immediately spoon the warm herb dressing over and around the rested mackerel fillets on the platter to serve.
Chef's Notes
- Select mackerel with clear, bright eyes, stiff iridescent skin, and a clean aroma of the open sea. Because pelagic oily fish oxidizes quickly, it is best cooked on the day of purchase.
- Scoring the skin serves a dual purpose: it interrupts muscle shrinkage to prevent curling and opens vents that allow subsurface oils to render out, crisping the skin in its own fat.
- Tarragon contains anethole, a volatile compound providing an aniseed finish that cleanly slices through the heavy lipids of mackerel without overwhelming its natural sweetness.
- Add the fresh tarragon only after removing the pan from the heat. Residual pan warmth activates its delicate herbal oils, whereas direct boiling heat scorches and dulls the herb.
Storage
Refrigerator: 2 days — Cool promptly and seal in an airtight container within 2 hours of cooking. Store in the coldest section of the refrigerator.
Reheating: Reheat gently in a lightly oiled skillet over medium-low heat until the internal temperature reaches at least 74°C (165°F), or flake the fish and serve cold over dressed salad greens.
Troubleshooting
Mackerel skin sticks to the pan and tears when attempting to turn the fillet
Cause: The pan was not sufficiently preheated, the skin was damp, or the fillet was disturbed before the crust formed
Fix: Cannot be fixed for torn skin; finish cooking through and serve the fillet flesh-side up with the warm tarragon dressing spooned over top
Prevention: Thoroughly pat the fish dry with paper towels, ensure the oil is shimmering hot before adding the fish, and do not attempt to turn it until the 3-minute mark
The fillets buckle and curl upward in the center during cooking
Cause: The skin was not scored or the fillet was not held flat against the pan floor during the initial heat exposure
Fix: Immediately press firmly with the spatula within the first 45 seconds of searing before the muscle protein sets permanently
Prevention: Make three shallow diagonal cuts across the skin and firmly press down with a flat fish spatula for the first 30 seconds of cooking
Cultural Context
Atlantic mackerel has long been a staple of British coastal fishing communities, celebrated from the Cornish coast to the Scottish highlands for its robust, meaty character. Traditionally paired with sharp, acidic accompaniments like gooseberries, cider vinegar, or sharp garden herbs to balance its unctuous fat content, it transitioned from an economical working-class fish to a centerpiece of modern British cooking. This dish highlights the classic British coastal technique of cutting rich, oily fish with bright vinegar and pungent aromatic herbs.
