Pickles & ferment bases
Suolasienet (salt-cured mushrooms base)
Suolasienet · A Northern/Eastern European salt-preservation base in which firm-fleshed wild mushrooms (classically milkcaps / Lactarius spp.) are blanched, layered dry with coarse salt under a weight, and held submerged in their own brine (or topped up with cooled salt water). The cured mushrooms are a reusable pantry component — never eaten as-is — that is soaked and rinsed before being finished into salads, sauces, pies, or zakuski.
The formula
100–150 g coarse salt per 1 kg blanched, drained mushrooms (~10–15% by weight)
Salt is measured against the post-blanch weight, never the raw weight. Kotiliesi gives 1–2 dl (~100–200 g) coarse sea salt per kg; Reseptivihko gives 100–150 g/kg. Top-up brine if liquid does not cover: 1 dl salt per 1 l water, boiled and cooled.
Identity
- Northern European salt-cured preserve — Finnish, Karelian, Russian, Polish tradition
- Dry-salt layering (suolaus kerroksittain) under a weight, fully submerged in own brine
- A reusable base / pantry component, NOT a finished dish — requires soaking and re-seasoning before service
- Classically uses milkcaps (Lactarius rufus, L. torminosus, L. trivialis / utilis), which are acrid and inedible raw
- Cold-pack only — warm mushrooms spoil rapidly under salt
- Long shelf life in cool storage: months to several years (Nordic Territory notes 'even for years')
Ingredients
| Base | Fresh milkcaps (rouskut) — Lactarius rufus, L. torminosus, L. trivialis, L. utilis | Must be blanched first; raw milkcaps are acrid/bitter and inedible. Northern milkcaps may turn slightly bluish on boiling — normal. |
| Seasoning | Coarse sea salt (karkeaa merisuolaa), non-iodized | 100–150 g per kg of blanched, drained mushrooms. Iodized table salt must be avoided — it inhibits cure and clouds brine. |
| Liquid | Water — for blanching and for top-up brine | Generous blanching water (e.g. 5 l per 1 kg per Kotiliesi). Top-up brine: 1 dl coarse salt per 1 l water, boiled and fully cooled before pouring over. |
Method
- 1Clean and trim: scrape milkcaps under running water with a knife; detach and discard stems; cut caps into 2–4 pieces.Removes forest debris and the woody stem; pieces pack more evenly under salt and brine.
- 2Blanch: boil the mushrooms in plenty of water for about 5 minutes; drain, rinse under cold water, squeeze out liquid, and cool completely.Boiling destroys the acrid/latex compounds that make raw milkcaps inedible and gives the cure a clean starting medium.
- 3Layer cold mushrooms with coarse salt in a clean glass, porcelain, or food-grade plastic vessel: salt on the bottom, alternating layers, finishing with a salt layer on top.Cold-pack only — warm mushrooms spoil easily under salt (Reseptivihko warning). Salt draws out moisture and creates the preserving brine in place.
- 4Press mushrooms tightly, cover with plastic film, and weight down so the layer is compressed and submerged in its own brine.A continuous weight guarantees the mushrooms stay under the liquid line; anything exposed to air will mould.
- 5Store cool (refrigerator or cold cellar). Periodically verify the mushrooms are fully covered; if brine is short, top up with boiled-and-cooled salt water (1 dl salt / 1 l water).Brine coverage is the only thing keeping anaerobic spoilage organisms out; uncovered mushrooms mould.
- 6Before use, scoop out the needed amount, rinse, then soak in plenty of cold water (often changed 1–3 times over several hours) to remove excess salt, then finish into a dish.Cured base is essentially saturated with salt; soaking brings it back to an edible seasoning level for the final preparation.
Techniques that matter
Dry-salt layer cure (kerroksittain suolaus)
Salt's osmotic pull extracts the mushrooms' own water to form a saturated brine — no added water needed if pack is tight and weight is correct.
Weighting and submersion check
Anchors mushrooms under the brine line; any mushroom breaking the surface is exposed to oxygen and airborne moulds.
Top-up brine (1 dl salt / 1 l water)
Standard safety valve when the mushrooms' own moisture is insufficient; only fully cooled brine is added so as not to restart spoilage risk.
Cold-pack rule
Warm tissue placed under salt is a known spoilage vector; cooling the blanched mushrooms before salting is non-negotiable per Finnish tradition.
Variations & derivatives
Martat brine method (Marttojen ohje)Finland (Martha organization)
Replaces dry salt layering with a pre-made cooled brine; gives a milder saltiness and is easier for small batches — the blogger notes it solved the over-salty sienisalaatti problem of the traditional dry method.
Traditional dry-layer Karelian / Russian cureKarelia, Russia
Dry salt between every layer, heavy weight, long cool cellar storage for months; mushrooms often carry a stronger, more pungent salted-mushroom flavor and are rinsed hard before use.
Polish Slavic fermented-style salt curePoland
Uses Russula and other firm mushrooms; close cousin of the Finnish method, often finished later into vinegar pickles (grzyby marynowane).
Spiced salt cureRussia / Ukraine
Black peppercorns, bay leaves, garlic, horseradish leaves, dill, or oak leaves added between layers — still a base, not a finished dish.
Used in these dishes
Substitutions
- Milkcaps (Lactarius rufus, L. torminosus, L. trivialis) → Other firm-fleshed Lactarius or Russula — valmuskat (Lactarius volemus), juurekkaat, vahakkaat, or even emetic russulas — Reseptivihko explicitly lists these as suitable; Slavic tradition uses russulas too. Always blanch first — raw specimens are acrid.
- Coarse sea salt → Kosher salt (non-iodized, coarse) — Same NaCl, similar crystal size; do not use iodized table salt — iodine inhibits the cure and can discolor the brine.
- Coarse sea salt → Iodized table salt — Iodine interferes with salt-curing and can cloud the brine; not recommended by any source.changes result
Troubleshooting
White/green mould or surface growth on the pack
Mushrooms broke above the brine line — uncovered tissue exposed to oxygen → Scoop off affected top layer, press remaining mushrooms back under the brine, top up with cooled 1 dl salt / 1 l water brine so everything is submerged.
Finished dish (e.g. sienisalaatti) is inedibly salty
Insufficient soaking after the salt cure — base sat in saturated brine for months and was used without enough water changes → Soak longer in cold water, changing the water 2–3 times; the home-cook blogger (lähde 5) notes this is a frequent failure of the dry-salt method and a main reason to switch to the Martat brine method.
Sour, off, or fermented-spoilage odor in the jar
Mushrooms salted while still warm, or pack not kept cold enough → Discard — warm-packed salt mushrooms spoil fast (Reseptivihko explicit warning). Always cool blanched mushrooms fully before layering.
Bluish tint on northern milkcaps
Natural oxidation in Lactarius trivialis / utilis during boiling →