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Haring (Cured Herring)

Name: Haring (Cured Herring)
Prep time: 1 h
Total time: 1 h
Yield: 4 servings
Cuisine: Dutch
Ingredients: 4 herring; 100 g coarse salt; 1 L water; 1 onion; 4 gherkins; 4 slices rye bread

The Dutch cured herring. It is neither cooked nor smoked: a light salting and a few days is all, and the flesh turns soft and buttery. What does that is not microbes and not acid but the fish's own digestive enzymes — which is why, when it is gutted, the pancreas is deliberately left in. Nothing is added; the whole dish is a matter of not throwing away what was already inside.

Ingredients

4servings

The cure (serves 4, 8 fillets)
herring · fat May-July fish; 15% fat or more is the standard4
coarse salt · about 12% of the weight of the fish100 g
water · for the brine1 L
To serve
onion · chopped very fine1
gherkins · Dutch *zuur*; sliced4
rye bread · optional — with bread it becomes a *broodje*4 slices

Steps

Safety first. This is eaten raw, and even in the Netherlands the law requires the fish to be blast-frozen at -45°C to kill Anisakis before sale. A domestic freezer does not reach that, so buy herring that has been blast-frozen for raw consumption and thaw it slowly in the fridge.
⏲ 10 min
Gut it, but leave the pancreas in. Cut behind the gills and pull out the gills and guts, but leave the pancreas where it is. That is the whole trick of the dish — the digestive enzymes in it spend the next few days breaking down the proteins in the flesh and softening it. Take everything out and you have salted fish and nothing more.
⏲ 15 min
Rinse in cold water and pat dry. Scrape off only the coarse scales; do not skin it.
⏲ 5 min
Dissolve the 100g of salt in 1L of water and chill it completely. This is a mild brine, not a strong one — the point is not to salt the fish heavily but to hold spoilage organisms back while the enzymes work.
⏲ 10 min
Submerge the fish in the brine and keep it at 0-4°C for 3 to 5 days. After a day the flesh has softened a little; by five it gives under a spoon. Stop before it turns slimy or smells sour.
Lift out, rinse, and open it along the backbone into two fillets. Run a thumb down to pull the pin bones. Leaving the tail on is traditional — that is what you hold it by.
⏲ 15 min
Spread the chopped onion on a plate, lay the fillets on it and add the gherkins. Serve cold. In bread it is a broodje haring; held by the tail with your head tipped back is how it is eaten at a stall.
⏲ 5 min

Tips & Variations

Variations

Hollandse Nieuwe: the name given only to the first catch of the season, in June. The day the first barrel is auctioned is news in the Netherlands.
Maatjes: young herring that has not yet spawned and is therefore fat. That is what the base recipe above uses.
Rolmops: cured herring rolled around a gherkin and onion and kept in vinegar. Acid takes over from the enzymes and the flavour is far sharper.
Zure haring: the older, saltier, longer cure. It has to be soaked before eating.
Swedish matjessill: the same young herring, but a sweet cure with sugar and spices, served with potatoes and sour cream. A different dish.

Tips

This is the only enzyme-driven cure here. Every other preserved dish on the site is worked by microbes or acid — kimchi and paocai by lactic bacteria, hongeo-hoe by bacteria converting urea to ammonia, ceviche by acid. Haring is worked by the fish's own digestive enzymes, which is why the only technique in it is not throwing them away.
Yeot imports its enzyme; this one keeps its own. Yeot sprouts barley to make amylase and adds it to rice; haring simply does not remove what is already inside.
The brine has to be mild. Salt it heavily and the enzymes stop too. The salt-concentration lever in fermentation works here as a ceiling rather than a floor — too salty and nothing happens at all.
Fish from May to July. Before spawning, herring is over 15% fat, and that fat is what turns enzyme-softened flesh buttery. After spawning it drops to around 5% and the same method gives a dry result.
The freezing is a texture measure as well as a safety one. As freezing and thawing puts it, ice crystals tear cells — and here that opens the way in for the enzymes, the same reason polbo á feira freezes octopus to tenderise it.
The onion and gherkins are not garnish. They put raw pungency and acid against an oily fish. Every safety note on ganjang-gejang applies: cold from gutting to serving.
A sour smell is a failure. What the enzymes make is softness and a nutty richness; spoilage smells sour. The two are distinguishable.