Grilled Pork Tenderloin with Chimichurri

Pork and dry brine (4 hours to a day ahead)

• 425 g pork tenderloin, silverskin trimmed off completely; heritage or well-raised if your butcher has it
• 5 g fine salt, about 1 level tsp, roughly 1% of the meat's weight

Spice oil

• 30 ml olive oil, a mid-range oil is fine; save the good bottle for the chimichurri
• 3 cloves garlic, grated to a paste
• 1 tsp ground cumin, best from whole seed, toasted and ground fresh
• 1 tsp smoked pimentón de la Vera, genuine Spanish, not generic smoked paprika
• 1 tsp dried oregano
• ½ tsp black pepper, freshly ground

Herb-garlic butter baste

• 30 g butter, good butter, cultured if you can; Alpine butter is the Swiss ingredient worth seeking out here
• 1 clove garlic, smashed, not grated — grated garlic scorches in hot butter
• 1 tsp fresh oregano or thyme, chopped; oregano bridges to the chimichurri

To serve

• 120 ml chimichurri, made the day before or the morning of, at room temperature — see the chimichurri recipe

Lactose-free alternative

• 30 g lactose-free butter, instead of the butter — browns slightly faster, so keep the baste at medium(optional)

Trim and dry-brine (4 hours to a day ahead)

1. 1

   Trim the silverskin completely: slip a thin blade under it, angle the edge slightly upwards, pull the skin taut and shave it off in strips. Pat the 425 g tenderloin dry.

   5m

   Silverskin never renders. Left on, it tightens in the heat and makes the loin bow on the grill, so it cooks unevenly.

2. 2

   Salt the whole surface evenly with the 5 g fine salt. Set the loin on a wire rack over a plate and refrigerate uncovered for at least 4 hours, ideally overnight, up to 24 hours.

   4hwire rack

   Salt is the only seasoning that reaches the interior of a cut; marinades barely get past 3mm. Given hours, the salt dissolves, is reabsorbed and partially dissolves the myosin so the muscle holds its water through the heat, which is the margin a lean cut desperately needs. Uncovered is the second half of the point: the surface dries, so it browns faster and picks up smoke better.

   Dry-Brining Lean Cuts

   Tip: Never salt 10–15 minutes before cooking: the salt has pulled moisture to the surface and not yet reabsorbed it, so you sear a wet exterior. Salt well ahead or right before, never in between. Do not rinse.

Mise en place

1. 3

   Mix the spice oil: the 30 ml olive oil, 3 cloves garlic, grated, 1 tsp ground cumin, 1 tsp smoked pimentón, 1 tsp dried oregano and ½ tsp black pepper. Hold at room temperature.

   3m

   No vinegar and no extra salt. The chimichurri already owns the acid, garlic and oregano, so the meat's coating is built around warmth and smoke to contrast the sauce instead of echoing it. A short vinegar marinade actively harms a lean loin: a controlled study on pork tenderloin found 2 hours of marinating increased hardness and chewiness against untreated meat; softening only started after about 12 hours.

2. 4

   Have the 30 g butter (or 30 g lactose-free butter), 1 clove garlic, smashed, and 1 tsp chopped oregano or thyme together in a small cast-iron pan or foil tray, and keep it cold until the baste. Take the chimichurri out of the fridge so it is at room temperature by the time you serve.

   2m

   Tip: Lactose-free butter browns slightly faster, because the lactase has already split some of the milk sugar into glucose, which caramelises sooner. Keep the basting heat at medium and pull the moment it smells nutty.

3. 5

   About 40 minutes before grilling, take the pork out of the fridge and coat it all over with the spice oil. Do not salt again.

   40m

   Tip: Two jobs at once: the loin comes up towards room temperature so it cooks evenly, and the oil paste sets a flavour layer on a surface that is already dry and seasoned from the brine.

Build the fire

1. 6

   Set up two zones: one side hot enough that you cannot hold your hand over it for more than a second or two, the other side cool, sitting at 150–160°C with the lid down. Charcoal banked to one side; on gas, all burners on except one or two.

   15mgrill with a lidprobe thermometer

   This is the whole game for a lean cut. Tenderloin has no fat buffer and a tapering shape: on a single hot zone the centre overshoots before the crust is built and the thin end is dry by the time the middle is done. The hot side makes crust; the cool side brings the centre up gently.

   Two-Zone Grilling and Carryover Control

Grill

1. 7

   Sear the tenderloin over direct heat, turning every 1–2 minutes to colour every face, 6–8 minutes in total. If flames lick up, slide it to the cool side for a few seconds until they settle.

   8mhigh, direct

   Frequent turning is not fussiness. It gives even browning, and the pimentón and garlic in the oil will catch and turn acrid if one face sits down too long.

   Two-Zone Grilling and Carryover Control
2. 8

   Move the loin to the cool zone and close the lid. Start probing the thickest point early and often; you are heading for 60°C.

   5m150–160°C, indirect, lid down

   Read the fat middle, never the taper. The thin end always runs several degrees ahead, so it reads done while the centre is still underdone. Lid down matters: the cool zone needs the convective heat to bring the centre up evenly.

   Two-Zone Grilling and Carryover Control
3. 9

   When the centre reaches about 57°C, set the pan with the 30 g butter, smashed garlic and herb on the cool zone. Once it foams, tilt it so the butter pools and spoon it continuously over the meat for 30–60 seconds, turning the loin once.

   1mmediumsmall cast-iron pan or foil traylarge spoon

   Nut-brown, not black. Butter has a low smoke point and the milk solids go from nutty to acrid in seconds, so keep the pan away from the flames and pull it the moment the smell turns nutty.

   Butter Basting (Arroser)

   Tip: Tenderloin is leaner than skinless chicken breast. Against an aggressively bright raw sauce, this baste is what stops the plate tasting thin: it supplies the fat the cut lacks, tightens and lacquers the crust and adds browned-butter depth.

4. 10

   Pull the tenderloin off the grill at 60°C at the thickest point.

   1m

   Pull below the safe figure on purpose. The USDA minimum for whole pork is 63°C with a 3-minute rest; a thin tenderloin carries over about 3°C while it rests, so pulling at 60°C lands it safely at 63°C with a faintly pink, juicy centre. Cooked to 63°C on the grate, it blows past it and dries out. Overcooking is the most common failure, and no sauce rescues it.

   Two-Zone Grilling and Carryover Control

Rest and serve

1. 11

   Tent loosely with foil and rest 6–8 minutes. Spoon any caramelised garlic and herb from the basting pan over the top.

   8m

   Non-negotiable on a lean cut. Cut early and the juice you protected ends up on the board, and the carryover from 60°C to 63°C does not complete.

   Two-Zone Grilling and Carryover Control
2. 12

   Slice across the grain on a slight bias into 1.5–2cm medallions. Lay them out and spoon about 120 ml chimichurri over at the table. Pass the rest in a bowl.

   2m

   Spoon, do not toss. Tossed through warm meat the herbs wilt and the sauce goes flat; spooned on at the end, the raw garlic and herbs stay bright against the smoke and the browned butter.