Argentine and Uruguayan in origin, dating to at least the 19th century gaucho tradition of cattle herding and open-fire asado. The word's etymology is debated — possibly Basque, possibly British immigrant influence.
Chimichurri is Argentina's defining condiment — a raw, uncooked herb sauce of flat-leaf parsley, oregano, garlic, red chilli flakes, red wine vinegar, and olive oil that is as fundamental to the Argentine asado as the fire itself. Unlike European herb sauces that might be refined and emulsified, chimichurri is deliberately rough-textured, bold, and vibrant — it is meant to be a foil to the richness of grilled beef, not a complement to its subtlety. The preparation is simple but the details matter enormously. Parsley must be flat-leaf, not curly — the flavour is completely different. Garlic is finely minced or pounded, not blended — raw garlic blended becomes bitter and uniformly sharp in a way that finely minced garlic does not. Dried oregano is standard in the Argentine tradition, not fresh — the earthy, slightly medicinal character of dried oregano suits the preparation better than the brightness of fresh. Red wine vinegar provides the acidic backbone that makes the sauce cut through rich, fatty asado cuts. The single most important variable is resting time. Chimichurri must rest for at least 30 minutes — ideally 2–4 hours, or overnight — before serving. This is not optional. During the rest, the vinegar draws moisture from the herbs and garlic, the flavours meld, the harsh edges of raw garlic soften, and the sauce becomes a unified whole rather than a collection of separate ingredients. Freshly made chimichurri tastes aggressive and disjointed; rested chimichurri is harmonious and remarkable. Beyond beef, chimichurri is excellent with roasted vegetables, grilled chicken, grilled prawns, or simply spread on bread. A variant chimichurri rojo replaces most of the parsley with roasted red pepper and includes paprika.
Sharp, herbal, garlicky, and acidic — a raw, vibrant counterpoint to the richness of grilled beef
Use flat-leaf parsley only — curly parsley has a completely different, inferior flavour Mince garlic by hand — blending makes it uniformly bitter and acrid Use dried oregano, not fresh — the Argentine tradition prefers the earthier, more robust character Rest for minimum 30 minutes, preferably 2–4 hours — this is the non-negotiable step Balance: the vinegar should be assertive but not acidic to the point of harshness
The ratio: 1 cup parsley, 1 tbsp dried oregano, 4 cloves garlic, 2 tbsp red wine vinegar, ½ tsp chilli flakes, 100ml olive oil — adjust to taste For serving with rare steak, make a slightly more acidic version — the char of the meat needs the vinegar to cut through Chimichurri rojo uses roasted red pepper and paprika as the base — a beautiful variation for chicken and pork The sauce keeps refrigerated for up to a week — it improves over the first two days Use the resting liquid that pools at the bottom as a marinade — it carries immense flavour
Not resting the sauce — raw, aggressive, and disjointed without the necessary mellowing time Using curly parsley — produces a different, blander result Blending the garlic — creates bitter uniformity instead of varied, textured sharpness Using fresh oregano — too delicate and grassy for this preparation Over-salting before resting — salt continues to draw moisture during the rest; season conservatively then adjust