Norwegian · appetizer

Rakfisk med Flatbrød (Salt-Fermented Trout)

Name: Rakfisk med Flatbrød (Salt-Fermented Trout)
Prep time: 42 min
Total time: 2160 h 57 min
Cuisine: Norwegian
Ingredients: trout — 2000 g; cold water — 2500 g; salt — 150 g; caster sugar — 25 g; sour cream — 200 g; red onion — 120 g; crisp flatbrød — 100 g; potatoes — 600 g; dill — 15 g; black pepper — 3 g; measures akevitt — 80 g

Rakfisk med Flatbrød (Salt-Fermented Trout) reads sweetness 5.3, salinity 4.0 and sourness 3.9 on Palate's 0–10 flavor X-ray — a Norwegian appetizer, about 2160 hr 57 min. Measured from the recipe itself: ingredients and technique.

The flavor X-ray — six axes, 0–10

Umami & Savory — 5.0 / 10
Sweet & Fruity — 5.3 / 10
Sour & Bright — 3.9 / 10
Bitter & Earthy — 1.6 / 10
Rich & Fat — 2.9 / 10
Aromatic & Spice — 4.1 / 10

The measured notes (of 18)

Sweetness 5.3 · Salinity 4.0 · Sourness 3.9 · Herbaceous 3.7 · Funk & Ferment 3.6 · Marine & Briny 3.2 · Umami 3.1 · Richness 2.8 · Allium 2.3 · Warm Spice 1.6 · Earthy 1.5 · Floral 1.0 · Heat 1.0 · Bitterness 0.8 · Nutty 0.5

What's in it (11)

trout — 2000 g
cold water — 2500 g
salt — 150 g
caster sugar — 25 g
sour cream — 200 g
red onion — 120 g
crisp flatbrød — 100 g
potatoes — 600 g
dill — 15 g
black pepper — 3 g
measures akevitt — 80 g

Time & effort: about 2160 hr 57 min (42 min active) · effort: medium

Nutrition (per 100 g, engine-estimated): 66.7 kcal, 7.6 g protein, 3 g fat, 2.1 g carbs

Dietary: Contains meat · Contains seafood · Contains dairy — engine-derived; double-check anything allergy-critical.

How it's cooked (7 steps)

Understand what rakfisk is: trout preserved by a slow salt fermentation at refrigerator temperature and then eaten raw, never cooked. It is not a cure like gravlaks, which is a fast salt-and-sugar draw eaten within days, and it is not smoked. The salt concentration and the cold are the only things holding the spoilage organisms back, and a warm cellar or a weak brine can produce botulinum toxin, which is why the Norwegian food authority publishes a specific procedure and why almost everyone buys rakfisk from a producer in Valdres rather than making it. Make it only if you can hold 4°C reliably for months and measure your brine.
Rinse the gutted fish thoroughly in cold running water, scraping out the bloodline along the spine with a spoon. Anything left in the belly cavity is where a bad batch starts.
Dissolve the salt and sugar in the cold water — 150 g of salt to 2.5 L is a 6% brine, and 6% is the figure to hit.
Pack the fish tightly backs-down in a food-grade plastic tub, pour the brine over so they are fully submerged, and weight them with a plate so nothing floats.
Ferment at a steady 4°C for 3 months. The flesh turns from firm and pink to soft, translucent and deep rose, and the smell becomes strong, sharp and cheesy. If the brine ever goes ropy or the fish smells of ammonia or sulphur, throw the batch away.
To serve, lift a fish out, pat it dry, and fillet it, slicing the flesh thinly off the skin at a shallow angle.
Lay the slices on the flatbrød with sour cream, red onion, dill and black pepper, with the warm potatoes alongside and a glass of akevitt. In Valdres this is a whole autumn festival, and the fish is graded by how far the ferment has been allowed to go.

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Keep reading: what sweetness, salinity, sourness mean in the flavor lexicon · the world's cuisines, by flavor.

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Every number above is Palate's engine-measured estimate, computed from this recipe's ingredients and techniques — not human-tasted ratings or reviews.