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Shirako: Japanese milt and the culture of fish

Shirako is being talked about more and more often. It appears in travel stories, in Japanese cooking videos, on the menus of some specialised restaurants and in many pieces of content dedicated to ingredients that can intrigue, surprise or divide the public.
The risk, when a food enters common discussion through its most unusual side, is to reduce it to a curiosity. In the case of shirako, that would be a mistake. Reducing it to fish sperm, with a slightly exaggerated tone, would be truly reductive: shirako is a precise way of reading the product, of giving value to every part of it, of working with seasonality, texture and the delicacy of the raw material.
Shirako is not a recent invention, nor a product created to shock. It is a traditional ingredient in Japanese cuisine, appreciated above all in the cold months and linked to a food culture that knows how to treat even the less usual parts of fish with great respect. To really understand it, we need to start from what it is, without beating around the bush but also without sensationalism.

What shirako really is

The word shirako refers to fish milt, meaning the male gonads of certain fish species. In English, it is often called milt or soft roe, to distinguish it from actual eggs, which are instead called roe or hard roe. In Italian, the most accurate term is lattume, a word rarely used in everyday language but also present in European gastronomic tradition.
In Japanese cuisine, shirako can come from different fish. The most common case is cod, but there are also preparations linked to other species, such as fugu, the famous pufferfish, or monkfish. It is not a uniform category: origin, quality, treatment and preparation vary greatly depending on the fish, the season and the skill of the person handling it.
Its particularity lies not so much in an intense flavour, but in its texture. Shirako is soft, creamy, fragile. It has a marine, delicate taste, with a sweet and savoury component that is enhanced by acidic condiments or very brief cooking. It is an ingredient that does not tolerate forcing: if it is handled badly it loses balance, if it is overcooked it changes structure, if it is not extremely fresh it simply becomes unpresentable.
Shirako is not an “extreme” food in the spectacular sense of the term. It is rather a product that tests the relationship between culture, technique and the consumer’s willingness to approach what they do not know. In Japan, it can be served in informal contexts, but also in high-end restaurants.

How it is eaten and prepared

The best-known preparations are essential. Shirako can be served raw, lightly blanched, cooked in broth, grilled or fried in tempura. One of the most common versions is with ponzu sauce, often accompanied by aromatic and fresh elements that balance its richness. The logic is clear: not to cover the product, but to accompany it.
This apparent simplicity is one of the keys to Japanese cuisine. When the raw material is fragile, the preparation must be precise. Light cooking can be enough to make the surface more compact without erasing the creamy part. A citrus-based condiment can lighten the fatty perception. A hot broth can turn shirako into a soft and enveloping ingredient, without making it heavy.
The reason why it divides opinion is just as clear. Even before tasting it, shirako asks the consumer to overcome a cultural resistance. Knowing what it is changes the perception of the dish. Some consider it a delicacy, others struggle even with the idea of trying it. It is an understandable reaction, because taste is never only taste: it is memory, habit, food education, familiarity with certain raw materials.
From this point of view, shirako is interesting precisely because it shows how much cuisine is linked to context. In one country it can be a traditional ingredient, in another it can appear unusual. The same happens with many foods that, outside their own cultural environment, change meaning, such as frogs, crickets, larvae or horse meat. Milt is not foreign to European gastronomic history, but over time it has almost completely disappeared from the common imagination. In Japan, instead, it has maintained a recognisable space, especially in seasonal cuisine.
Its recent international visibility also comes from this. The public looks for new flavours, restaurants tell the story of less predictable ingredients, digital content amplifies everything that generates surprise. But shirako cannot really be understood if it is seen only as a trend. It is a product that existed before the fashion around it and, to be described well, must be brought back to its natural ground: fish, the season, and the hand of the person cooking it.

Freshness, safety and process

When talking about shirako, food safety is not a technical detail. We are talking about a delicate seafood product, often served raw or lightly cooked. This requires strict controls, proper cold chain management, knowledge of the raw material and compliance with the procedures required for fishery products intended to be eaten raw or almost raw.
The first point is freshness. Shirako has a fragile structure and a short shelf life. It must be selected carefully, stored at the correct temperature and processed quickly. The perceived quality on the plate depends on choices that begin long before service: fishing, selection, transport, storage, cleaning, preparation.
The second point concerns parasites. In fishery products eaten raw or lightly cooked, the risk of Anisakis is one of the most important aspects to consider. European authorities indicate specific freezing or heat treatments to inactivate viable parasites in fishery products when the intended processing is not sufficient to eliminate them. This does not mean creating alarm, but remembering that behind a delicate ingredient there must be professional management.
The third point concerns the most sensitive species. When talking about fugu shirako, the issue becomes even more delicate. Fugu is known for the possible presence of tetrodotoxin in some parts of the fish, a toxin that is not eliminated by normal cooking. In Japan, its preparation requires specific skills and strict regulation. Here too, the message is not fear: it is the central role of technical knowledge.
In the end, shirako tells precisely this story. There are ingredients that cannot be separated from the process that makes them safe, good and consistent with the tradition they come from. Cuisine is not only the final gesture on the plate. It is a chain of decisions: choosing, storing, handling, dosing, cooking, serving.
For this reason, shirako is an interesting case even beyond Japanese cuisine. Not because everyone should try it or appreciate it, but because it clearly shows how much the meaning of a food can change when it is looked at carefully. From exotic curiosity it becomes raw material. From provocation it becomes culture. From passing trend it becomes an opportunity to talk about freshness, safety, precision and respect for the product.
Shirako asks exactly this: less easy amazement, more knowledge.

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