Gravlax — from the Old Norse for buried (grav) salmon (lax) — was originally preserved by burying the salted fish in the ground to ferment slightly. The modern preparation, without the fermentation stage, achieves a cleaner, brighter result. Pépin's treatment addresses gravlax as the primary curing technique — a bridge between classical French preparation and the Scandinavian tradition that has been absorbed into the modern classical kitchen.
The preservation and flavouring of raw fish through the application of salt, sugar, and aromatics — a cold process that denatures the surface proteins of the fish, draws out moisture, and creates a texture and flavour that neither raw nor cooked fish achieves. Gravlax is the Scandinavian application of the same preservation physics that defines the Japanese shiozuke, the Chinese salt fish, and the salt cod of the Mediterranean. The technique is among the oldest in the culinary world; its results, when the fish and the cure are both correct, are among the most refined.
Curing salmon transforms its flavour by concentrating the amino acid compounds — the same glutamate amplification that makes dried fish so potent, achieved here through dehydration rather than heat. As Segnit notes, dill and salmon is a pairing of the same aromatic family: dill's anethole and carvone compounds share volatile territory with the omega-3 fatty acids of the salmon, creating a combined aroma where the herb and the fish carry each other. The sugar in the cure is not merely a flavour balance agent — it participates in the osmotic exchange with the fish's cells, drawing moisture outward while allowing the aromatic compounds of the dill and aromatics to penetrate inward.
**Ingredient precision:** - Salmon: a whole side of salmon, skin-on, pin-bone removed (Entry 12). The pin bones must be removed before curing — they cannot be removed from cured fish without tearing. Wild Atlantic or Pacific salmon produces a more complex flavour; farmed salmon a more uniform result. Fresh fish only. - Salt: coarse sea salt or kosher salt — not table salt (too fine, penetrates too fast and produces an unevenly cured, over-salted result in the same time). - Sugar: white caster sugar or brown sugar. Brown sugar adds a mild molasses depth; white allows the salmon's own flavour to dominate. - Dill: generous — an entire bunch per side. Both the fronds and the stems, roughly chopped. Dill is not decoration; it is a flavouring agent. - Optional aromatics: lemon zest, cracked black pepper, aquavit or vodka (a tablespoon brushed over the flesh before the cure is applied). **The cure ratio:** - Standard: equal parts salt and sugar by weight. For a more assertive cure (firmer, saltier): increase salt to 60%, reduce sugar to 40%. For a sweeter, more delicate cure: reverse the ratio. - Quantity: approximately 60–80g total cure mix per 500g of fish. **The process:** 1. Lay the salmon skin-side down on a large piece of plastic wrap. 2. Spread the cure mixture evenly over the flesh surface. 3. Distribute the dill and any aromatics over the cure. 4. Place a second side of salmon flesh-to-flesh (or fold the plastic over a single side). 5. Wrap tightly. Place on a tray. Weight with a heavy cutting board — the weight accelerates moisture extraction. 6. Refrigerate for 24–48 hours, turning the package every 12 hours. The longer the cure, the firmer and more flavourful the result. 7. Unwrap, scrape off the cure, rinse briefly under cold water, and pat dry. Slice thinly on the diagonal — long, transparent, even slices. Decisive moment: The curing time — and the decision of when to stop. A 24-hour gravlax is lightly cured: the texture is still close to raw salmon, the flavour is mild and fresh. A 48-hour gravlax is firmly cured: the texture is noticeably denser, the flavour more pronounced, the colour deeper. Both are correct for different applications. Beyond 72 hours: the salt penetration is so deep that the salmon becomes over-salted throughout and the texture becomes dry. The decision of when to unwrap is made by tasting a thin slice from the edge. Sensory tests: **Feel — the cured surface:** After 24 hours: press the thickest part of the flesh. Correctly curing salmon feels noticeably firmer than raw — the surface proteins have begun to denature from the salt. The moisture drawn to the surface should be visible as a small puddle of salmon-coloured liquid in the package. **Sight — the colour change:** Raw salmon is translucent pink-orange. After 24 hours of curing: the flesh becomes opaque and deeper in colour — the protein denaturation is visible as a change from translucent to opaque. The skin side shows little change; the flesh side shows the full extent of the cure's penetration as a colour gradient from the cured surface inward. **Taste — the edge test:** Slice a thin piece from the thinnest edge of the cured side. Taste it. It should be flavoured throughout — not raw in the centre, not aggressively salty. If it tastes primarily of salt, the cure ratio was too heavy or the fish too thin for the time applied. **Smell:** Correctly cured gravlax smells of dill, lemon, and a mild, clean fish note — nothing aggressive, nothing sharp. Any ammonia note means the fish was not fresh before curing. Any sourness means the fermentation stage has begun inadvertently — the temperature was too high during curing.
- Gravlax can be refrigerated after slicing for 2–3 days, arranged in thin slices on parchment — it actually improves slightly as the flavour continues to develop - The classic mustard-dill sauce (hovmästarsås): Dijon mustard, sugar, white wine vinegar, and neutral oil emulsified cold, with dill added — the acid and sweetness of the sauce are designed to cut through the richness of the salmon and amplify the dill note - Beetroot gravlax: replace half the dill with coarsely grated raw beetroot in the cure — the beetroot juice penetrates the salmon and produces a vivid magenta exterior with a dramatic flavour depth
— **Unevenly cured — raw in centre, over-salted at edges:** The cure was applied unevenly, or the fish was too thick for the time applied. Turn more frequently for thick sides. — **Mushy texture:** The fish was not fresh enough. Curing accelerates deterioration if the fish was already beginning to age — the enzymes in the flesh continue working under the salt. — **Over-salted:** Too much cure applied, too long a curing time, or too fine a salt. The salt penetration in coarse salt is slower and more controllable.
Jacques Pépin's Complete Techniques