Proteins
Ikura (Salmon Roe)
Large, glossy salmon eggs that burst with briny, savory pop. Used as a sushi and donburi topping or garnish; serve cold and unheated to keep the pop.
Ikura is the Japanese preparation of mature salmon eggs: skeins (ovarian membranes) of roe are separated into individual eggs, rinsed, and briefly marinated in a soy-and-mirin cure. The result is a glossy, translucent bead roughly 5–8 mm across, with a thin elastic skin holding a liquid interior. When bitten, the membrane splits cleanly and the egg floods the mouth with a cool, briny, faintly sweet liquid — a textural signature so distinctive that it has its own word in sushi vocabulary: the pop.
What makes ikura special in the kitchen is less its flavor (a clean, oceanic brininess) than the engineering of the egg itself. The membrane is fragile but resilient: it survives the cure, gentle stirring, and a short rest on rice, but ruptures irreversibly under heat or when frozen and thawed repeatedly. That fragility is why ikura is always served cold or at cool room temperature, never cooked, and why storage discipline matters as much as procurement.
The cure itself is a Japanese adaptation of the older Russian salt-cure called malassol. In Hokkaido, where most of Japan's wild supply originates, the standard ratio is roughly equal parts soy sauce, sake, and mirin (sometimes lightened with dashi) with a pinch of sugar, used to marinate the eggs for 15 to 60 minutes. Longer soaks do not deepen flavor so much as toughen the membrane and oversalt the interior — the difference between a 20-minute cure and a 4-hour cure is the difference between lively pop and rubbery marbles.
- Measured in
- g
- Storage
- Refrigerate
Allergens
Find it in
Types & varieties
The everyday standard; medium 5–6 mm eggs, bright orange, balanced salt and sweetness — most affordable and most widely available
Slightly smaller eggs, deeper orange-red; often considered premium for a cleaner, less oily brininess
Smallest eggs (~4–5 mm) with deep ruby-red color and the most concentrated flavor; prized for color as much as taste
Small, pale orange eggs; the workhorse of the Russian and Alaskan fisheries, economical and mild
The largest eggs available, up to 8 mm, with a rich, buttery character; rare and expensive
Year-round availability, large uniform eggs; quality varies with feed, but consistent sizing makes it popular for plating
Whole unskinned skeins, cured in long strips and either eaten as-is with rice and nori or broken into loose ikura at the table
Salt-only cured in the Russian malassol tradition, or soy-cured in the Japanese style; the soy cure dominates sushi applications
Selecting quality ikura
Most of the ikura sold inland — including most "fresh" product at sushi counters — has been previously frozen, often at sea. Freezing, done correctly with rapid blast-freezing, does not destroy the pop; thawing and refreezing does. Learn to read the eggs, not the label.
- Glossy, plump, uniform beads with taut membranes indicate a careful cure and good cold-chain management.
- Color should be even and saturated within a species' range — dull, matte, or two-toned eggs are past their prime.
- A clean oceanic or sea-brine aroma is correct; a sharp fishy or ammonia smell means breakdown has begun.
- Cloudy brine in the jar suggests broken eggs releasing their liquid — a defect, not a sign of richness.
- Sujiko should have a firm, intact membrane; sagging or torn skeins will lose eggs during curing.
Curing ikura at home
Curing your own from sujiko is straightforward and dramatically cheaper than buying loose cured roe, though it requires care with temperature and timing. The goal is to season the interior of each egg, not to cook or pickle it.
- Soak whole sujiko skeins in cold water for 5–10 minutes to release blood and loose fragments, then pat dry on paper towels.
- Slit each skein lengthwise with kitchen shears and gently rub the eggs free over a bowl of cold water; the membrane will stay behind. Work over a fine-mesh strainer so the eggs are caught while loose fragments and water drain away.
- Mix the cure: equal parts soy sauce, mirin, and sake (or substitute dashi for some of the soy to lighten the salt and deepen umami), plus a generous pinch of sugar and a small splash of vodka or sake. The alcohol firms the membrane.
- Drain the eggs thoroughly, then pour the cold cure over them and refrigerate for 15–30 minutes. Taste a few eggs at 15 minutes — they should be seasoned through but still springy.
- Drain in a fine-mesh sieve, spread on a tray lined with paper towels, and chill uncovered for 10–15 minutes so surface brine evaporates. Transfer to a sealed container and use within 48 hours.
Storage and the pop
The pop is fragile: it is ruined by heat, by mechanical damage, and by ice-crystal formation during slow freezing or refreezing. Storage is the single most important variable after the initial cure.
- Keep unopened jars at 0–4 °C, ideally on the coldest shelf, not the door where temperature fluctuates.
- Once opened, transfer to a small airtight container with as little headspace as possible; oxidation dulls color and flavor within 24 hours.
- Never refreeze thawed ikura. The ice crystals rupture enough membranes that the second thaw produces a wet, broken paste.
- Do not stir aggressively when portioning; broken eggs leak liquid and dilute any sauce they sit in, including the vinegar of sushi rice.
Common uses
Tips & pitfalls
- Never apply heat: a warm bowl of rice is fine, but anything hot enough to soften butter will collapse the eggs into a paste.
- Marinate for 15–30 minutes, not hours: longer soaks make the membrane rubbery and over-salt the interior.
- Add a small splash of sake or vodka to the cure: alcohol firms the membrane and preserves the snap.
- Drain and pat dry before plating: pooled brine will soak into rice and turn sushi rice muddy and oversalted.
- Stir with a wooden or mother-of-pearl spoon, not metal: metal can bruise the eggs and impart a faint tinny note.
- Balance built-in saltiness with grated daikon, a thin slice of lemon, or a pinch of yuzu zest rather than extra soy sauce.
- Place wasabi beneath the roe as a small dab, never mixed in: it lifts the brininess without dominating.
- Buy only what you can use in 1–2 days after opening: ikura is one of the few luxury ingredients with almost no useful second life.
Nutrition
Energy
1105 kJ · per 100 g
Where the calories come from
Protein
24.6g
49% DV
Carbs
4g
1% DV
Fat
17.9g
23% DV
Fiber
0g
0% DV
Sugars
0g
of which
Sodium
1500mg
65% DV
Source · USDA FoodData Central · approx. Fish, caviar, black and red, granular
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Good to know
- Japanese name
- イクラ (ikura), borrowed from Russian "ikra" (икра), meaning roe or caviar
- Egg diameter
- Approximately 5–8 mm, depending on salmon species; king (Chinook) eggs are the largest, sockeye the smallest
- Standard cure
- Soy sauce, mirin, and sake (or dashi) at roughly 1:1:1 by volume, sometimes with a pinch of sugar; 15–60 minutes
- Yield from skeins
- Loose ikura from whole sujiko skeins yields roughly 50–60% edible roe after membrane is removed
- Service temperature
- Served cold or at cool room temperature; never heated, as heat ruptures the membrane
- Storage (unopened)
- Refrigerate at 0–4 °C; commercially frozen product keeps for months at –18 °C
- Storage (opened)
- Use within 1–2 days refrigerated; do not refreeze thawed roe, as ice crystals destroy the pop
- Allergen & nutrition
- Fish allergen; not suitable for low-sodium diets due to the soy-cure salt load; ~200–270 kcal per 100 g cured, rich in omega-3 and cholesterol
Substitutes
- Tobiko (flying fish roe) — Smaller and crunchier with a smoky note; works in gunkan-maki but lacks the liquid burst
- Masago (capelin roe) — Small, soft, often dyed; the closest visual stand-in at a lower price, but milder and less oceanic
- Cured trout roe — Similar size and clean pop; slightly milder sweetness, swaps in cleanly for cold preparations
- Steelhead roe — Functionally identical to salmon roe; often sold interchangeably where available
- Paddlefish or hackleback caviar — Closest match in texture and brininess, with a more pronounced "caviar" character; significantly pricier
- Lumpfish roe — Firm, small, often dyed red or black; budget option, much milder and less luxurious in feel
- Karashio kombu-bonito 'caviar' — Vegan option; mimics the look of roe but is a flavor and aroma substitute, not a real replacement for texture or richness
Pairs with
Also called
salmon roe · salmon caviar · red caviar
