Scandinavian cuisine is built on a foundation of preservation techniques developed to survive long winters — smoking, curing, pickling, fermenting, and drying. Gravlax (sugar-salt cured salmon), surströmming (fermented herring), pickled cucumbers, dried and reconstituted stockfish, and lingonberry preserves are all survival techniques that became beloved traditions. The New Nordic movement (led by Noma, Fäviken, and Geranium) reclaimed these ancient techniques — fermentation especially — and combined them with foraging, hyper-seasonality, and a commitment to only using ingredients that grow in the Nordic region. The Noma Guide to Fermentation codifies these techniques for any kitchen.
Gravlax: salmon fillet cured in a mix of salt, sugar, white pepper, and dill for 48-72 hours under weight in the refrigerator. The cure draws moisture out while the salt and sugar penetrate. The ratio matters: typically 2:1 sugar to salt for Scandinavian style (more sugar than most cures). After curing, the surface is wiped clean and the fish is sliced thin on a bias. Fermentation (per Noma): lacto-fermentation of virtually any fruit or vegetable using 2% salt by weight, vacuum-sealed or in jars. Garums: protein-rich ingredients (beef, chicken wings, fish, even bees) combined with koji (Aspergillus oryzae) and salt, fermented for weeks to months into concentrated liquid umami sauces — the Nordic equivalent of fish sauce or soy sauce, but made from local ingredients.
The Noma Guide to Fermentation (on your shelf) is the single best starting point for understanding how fermentation works as a universal technique. Start with lacto-fermented hot sauce: blend fresh chillies with 2% salt by weight, jar it, leave at room temperature for 7-10 days. The result is a living, complex hot sauce that develops over time. For gravlax: add a shot of aquavit or gin to the cure for Scandinavian authenticity. Beetroot added to the cure turns the salmon magenta — visually stunning. The koji-based garums from Noma are a frontier technique — the chicken wing garum takes 8 weeks but produces an umami concentrate unlike anything else.
Under-curing gravlax — it should be firm and translucent, not raw-textured. Over-curing until it's too salty — 48-72 hours is the window. Slicing too thick — gravlax should be paper-thin on a bias. For fermentation: not enough salt (below 2% risks bad bacteria), too much salt (above 5% slows fermentation to a crawl). Not understanding that fermentation is time-and-temperature dependent — warmer ferments faster, colder ferments slower with more complex results.