Summary: Tuna belly is the ventral part of the tuna, the belly area that extends from under the head to the tail. It is the fattiest, most tender, and most prized cut of tuna — the marine equivalent of ox steak or Iberico "secreto." In Japanese, it is called toro and is the star piece of high-end sushi, where a single nigiri of otoro (fatty belly) can cost 15-20 euros in a Tokyo restaurant.
What is tuna belly?
Tuna belly is the ventral part of the tuna, the belly area that extends from under the head to the tail. It is the fattiest, most tender, and most prized cut of tuna — the marine equivalent of ox steak or Iberico "secreto." In Japanese, it is called toro and is the star piece of high-end sushi, where a single nigiri of otoro (fatty belly) can cost 15-20 euros in a Tokyo restaurant.
Anatomically, tuna belly represents barely 10-15% of the tuna's total weight. This area of the fish is where intramuscular fat accumulates, as tuna needs energy reserves for its long oceanic migrations through cold waters. This fat infiltrated between the muscle fibers is what gives tuna belly its buttery texture, extraordinary juiciness, and deep, intense flavor.
In Spain, the tradition of utilizing tuna belly dates back to the almadrabas of southern Andalusia and Murcia, where bluefin tuna has been caught since Phoenician times. The almadraberos always knew that the tuna's belly was the most prized part and was reserved for the captain's family or for special occasions. Today, tuna belly has become democratized thanks to gourmet canned tuna, which has made this delicacy accessible to any table.
It is important not to confuse tuna belly with other cuts. The loin is the dorsal part, leaner and firmer. The flank is the lateral part, intermediate in fat. The morrillo is the area near the head, also highly prized. And cocochas, although not from tuna, are sometimes compared for their gelatinous texture. Tuna belly is specifically the belly, and any piece that does not come from that area, no matter how it is labeled "ventresca," is not.
Why tuna belly is the most valued part
Tuna belly concentrates the qualities that every gourmet seeks in a premium product: texture, flavor, and history. These are the specific reasons why it is the king cut of tuna:
- Intramuscular fat: between 15-25% fat (compared to 2-5% for the loin), infiltrated between the muscle fibers like the marbling of good wagyu. This translates into a melt-in-your-mouth texture without the need to chew.
- Concentrated Omega-3: the fat in the tuna belly is especially rich in omega-3 fatty acids (EPA and DHA), with up to 3-4 grams per 100 g. It is one of the most concentrated natural sources of omega-3 available.
- Complex flavor: fat is a vehicle for flavor, and tuna belly offers notes ranging from clean sea to an almost meaty aftertaste, with hints of walnut and butter. Cooked, it develops irresistible toasted and caramelized aromas.
- Relative scarcity: from a 200 kg tuna, the belly represents about 20-30 kg. This limits the supply and raises the price, but also guarantees that each piece is special.
- Versatility: it can be eaten raw (sashimi, tartare), semi-raw (tataki), grilled, barbecued, confit, or canned. Each method reveals different facets of the same cut.
The Japanese classification of toro
In the Japanese sushi tradition, tuna belly is divided into three categories according to its fat content:
- Otoro (大トロ): the fattiest part, close to the central belly. Pale pink color with very pronounced white streaks. It literally melts in your mouth. It is the most expensive and coveted cut.
- Chutoro (中トロ): medium fat, an intermediate area between the belly and the loin. Perfect balance between the oiliness of otoro and the meaty flavor of akami. For many, the optimal point.
- Akami (赤身): the lean part of the loin, intense red color. Cleaner, more direct flavor, firmer texture. It is the most common cut of tuna for sashimi.
Fresh vs. canned tuna belly
They are two different products that share a name but offer distinct gastronomic experiences. Both have their place in the kitchen.
Fresh tuna belly
Fresh tuna belly is a seasonal product with limited availability. The bluefin tuna season in the Mediterranean runs from May to July (almadraba season), and outside that window, it is difficult to find fresh bluefin tuna belly. Yellowfin tuna (Thunnus albacares) is more available year-round, but its belly, although good, does not reach the complexity of bluefin.
- Appearance: pink flesh with well-defined white fat streaks.
- Texture: tender, fatty, almost buttery when raw.
- Price: between 40-80 €/kg for bluefin tuna, 15-30 €/kg for yellowfin.
- Use: grilled, barbecued, tataki, sashimi, carpaccio.
Canned tuna belly
Canned tuna belly is accessible year-round and has reached extraordinary quality levels in Spain. The best canneries in the Cantabrian Sea and Galicia produce tuna belly in olive oil that are true gastronomic jewels, ready to serve directly from the can.
- Appearance: irregular fillets (the natural shape of the belly) in olive oil, sometimes with the skin.
- Texture: soft, flaky, melts with a fork. The skin provides gelatin.
- Price: between 30-80 €/kg depending on the brand, type of tuna, and oil used.
- Use: directly from the can as a tapa, in salads, on toast, with peppers.
At Bacalalo we have a selection of canned tuna and bonito that includes some of the best tuna bellies on the market, artisanally prepared with extra virgin olive oil.
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How to cook fresh tuna belly
Pan-seared tuna belly (the most popular method)
Grilling is the ideal method for tuna belly because it applies intense heat for a short time, creating a toasted exterior crust while the interior remains pink and juicy. The fat in the tuna belly melts slightly with the heat, bathing the meat in its own oiliness.
- Take the tuna belly out of the fridge 20 minutes before cooking to bring it to room temperature.
- Pat the surface very dry with paper towels (moisture prevents searing).
- Season generously with salt and pepper just before cooking.
- Heat the griddle or pan over high heat until it smokes slightly. Add a minimal drizzle of oil (tuna belly has its own fat).
- Place the tuna belly and do not touch it for 90 seconds. A golden crust should form.
- Flip and cook for 60-90 seconds on the other side.
- Remove and let rest for 2 minutes before slicing.
Ideal doneness: seared on the outside, pink on the inside. Overcooked tuna belly loses its fat and dries out, becoming a completely different (and inferior) product. If using a thermometer: 45-50 °C (113-122 °F) in the center for a perfect medium-rare.
Tuna belly tataki
Tataki takes minimal cooking a step further: the surface is seared for just 20-30 seconds per side over very high heat, then sliced thinly. The interior remains completely raw, like sashimi with a crust. It is served with ponzu sauce (soy, lemon, mirin), grated ginger, and spring onion.
Grilled tuna belly
Charcoal adds a smoky flavor that masterfully complements the fat of the tuna belly. The technique is similar to grilling but with a greater distance from the heat to prevent the fat from dripping and causing flare-ups. The result has a more rustic and deep character.
Recipes with tuna belly
Pan-seared tuna belly with mild aioli
Ingredients
- 4 portions of fresh tuna belly (150 g each)
- Flaky salt (Maldon or similar)
- Freshly ground black pepper
- Extra virgin olive oil
- 1 lemon
For the mild aioli
- 4 tablespoons homemade or quality mayonnaise
- 2 finely grated garlic cloves
- 1 tablespoon lemon juice
- 1 tablespoon extra virgin olive oil
Step-by-step preparation
- Prepare the aioli: mix the mayonnaise with the grated garlic, lemon juice, and oil. Let it rest for at least 30 minutes in the fridge for the garlic to infuse.
- Bring the tuna belly to room temperature 20 minutes before cooking. Pat dry with paper towels.
- Heat a griddle or cast-iron skillet over high heat. When it smokes, add a drizzle of oil.
- Season the tuna belly with salt and pepper and place it on the griddle. 90 seconds without touching. Flip. 60-90 more seconds.
- Remove, let rest for 2 minutes. Slice into thick 1 cm slices.
- Serve with a spoonful of aioli on the side, flaky salt on top, and a squeeze of lemon.
Canned tuna belly salad with peppers
Ingredients
- 1 can of tuna belly in olive oil (200 g)
- 2 roasted piquillo peppers
- 1 large ripe tomato sliced
- Half a red onion, thinly sliced
- Black olives
- Extra virgin olive oil
- Sherry vinegar
Step-by-step preparation
- Arrange the tomato slices as a base on a large plate.
- Distribute the red onion rings and the piquillo peppers cut into strips.
- Open the can of tuna belly and place the fillets over the vegetables, gently flaking them with a fork.
- Add the black olives.
- Dress with extra virgin olive oil and a drizzle of sherry vinegar.
- Let rest for 10 minutes at room temperature before serving for the flavors to meld.
This salad is a complete dish: protein from the tuna belly, vitamins from fresh vegetables, and healthy fats from olive oil and the fish itself.
Canned tuna belly: choosing the best
The market for canned tuna belly in Spain is extensive and of the highest quality. These are the keys to choosing:
- Tuna species: tuna belly from Thunnus thynnus (bluefin tuna) is the most premium and expensive. That from Thunnus alalunga (bonito del norte or albacore) is more accessible and excellent. That from Thunnus albacares (yellowfin) is the most common and economical.
- Oil: extra virgin is the benchmark. Some canneries use olive oil (not extra virgin), which is of lower quality. Sunflower oil is the most basic option. The oil from the can can also be used: it's a delicious sauce for dipping bread.
- Texture of the fillets: artisanal tuna belly is hand-packed, with irregular fillets and skin included. Industrial versions may be more uniform but less authentic.
- Origin: canneries in the Basque Country (Ortiz, Arroyabe), Cantabria, and Galicia have a centuries-old tradition in fish canning. Look for designations like "artisan production" or "hand-packed."
Discover our selection of premium canned tuna and bonito at Bacalalo, with selected tuna bellies from the best Spanish canneries. You can also explore our complete collection of gourmet preserves to find exceptional products.
Nutritional value and omega-3
Tuna belly is a food with an extraordinary nutritional profile, especially for its content of healthy fats:
- Calories: 180-220 kcal per 100 g (depends on fat content).
- Proteins: 20-24 g per 100 g, of high biological value.
- Total fats: 12-18 g per 100 g, most of which are unsaturated.
- Omega-3 (EPA + DHA): 3-4 g per 100 g. This is 3-5 times more than the loin of the same tuna and makes tuna belly one of the richest sources of omega-3 available.
- Vitamins: B12 (up to 10 μg/100g), vitamin D (up to 200 IU/100g), niacin, and vitamin A.
- Minerals: selenium, phosphorus, iron, magnesium, and potassium.
The omega-3s in tuna belly contribute to cardiovascular health, brain function, inflammation reduction, and skin health. A 150g portion of tuna belly more than covers the daily omega-3 needs recommended by the WHO (250-500 mg/day of EPA+DHA).
Sustainability and price
Responsible tuna consumption is a relevant issue. Atlantic bluefin tuna (Thunnus thynnus) was on the verge of overfishing, but thanks to strict quotas managed by ICCAT, populations have recovered significantly in the last decade. Today, bluefin tuna fishing is regulated with individual quotas and complete traceability from catch to consumption.
The price of tuna belly reflects its scarcity and quality:
- Fresh bluefin tuna belly: 40-80 €/kg in season (May-July). Out of season, practically impossible to find fresh.
- Fresh yellowfin tuna belly: 15-30 €/kg, available year-round.
- Premium canned tuna belly: 8-20 € per 100-200g can (equivalent to 40-100 €/kg).
- Standard canned tuna belly: 4-8 € per can.
Is the price worth it? Absolutely. A can of premium tuna belly is an accessible luxury that transforms a simple toast into a gourmet experience. And a fresh pan-seared tuna belly for two people costs 15-25 euros — less than a mediocre meal in many restaurants.
Conclusions
- What is tuna belly?: Tuna belly is the ventral part of the tuna, the belly area that extends from under the head to the tail.
- Why tuna belly is the most valued part: Tuna belly concentrates the qualities that every gourmet seeks in a premium product: texture, flavor, and history.
- Fresh vs. canned tuna belly: They are two different products that share a name but offer distinct gastronomic experiences.
- How to cook fresh tuna belly: Grilling is the ideal method for tuna belly because it applies intense heat for a short time, creating a toasted exterior crust while the interior remains pink and juicy.
- Recipes with tuna belly: This salad is a complete dish: protein from the tuna belly, vitamins from fresh vegetables, and healthy fats from olive oil and the fish itself.
Frequently asked questions
What is the difference between tuna belly and tuna loin?
Tuna belly is the ventral (belly) part of the tuna, with 15-25% intramuscular fat. The loin is the dorsal part, much leaner (2-5% fat). Tuna belly is more tender, juicy, and flavorful, but also more expensive and less available. The loin is ideal for preparations where a firm texture is desired; tuna belly, where oiliness is sought.
Can tuna belly be eaten raw?
Yes, tuna belly is the star cut of tuna sashimi (toro). For raw consumption, it must be sashimi-grade (previously frozen at -20 °C for 24h if fresh). Canned tuna belly is already cooked by the sterilization process, so it is not the same as raw tuna belly.
How long to cook tuna belly on the griddle?
90 seconds on the first side, 60-90 seconds on the second. The tuna belly should be seared on the outside and pink on the inside. If overcooked, the fat melts and is lost, leaving a dry and fibrous piece. The ideal internal temperature is 45-50 °C for medium-rare.
What is toro in sushi?
Toro is the Japanese name for tuna belly. It is divided into otoro (the fattiest part, streaked with white) and chutoro (medium fat, more balanced). Otoro melts in the mouth and is the most expensive nigiri in sushi. Chutoro offers a balance between fat and meaty flavor that many consider the perfect point.
Does canned tuna belly lose omega-3 during sterilization?
Omega-3s are relatively stable to the heat of the canning process. Studies show that canned tuna belly retains between 70-85% of its original omega-3s. Furthermore, some of the omega-3s migrate to the covering oil, which can also be consumed (and should be: it is an enriched and delicious oil for dipping bread).
What is the best brand of canned tuna belly?
In Spain, canneries in the Basque Country and Cantabria produce the best tuna bellies: Ortiz, Arroyabe, Los Peperetes, Güenaga, among others. Always look for bonito del norte or bluefin tuna belly, in extra virgin olive oil, artisanal preparation. Discover our selection at Bacalalo.
Can I freeze fresh tuna belly?
Yes, fresh tuna belly can be frozen for up to 3 months without significant loss of quality. Wrap it tightly in plastic wrap, then in a freezer bag, expelling the air. Thaw slowly in the refrigerator (12-24 hours). Never thaw in the microwave or at room temperature, as the texture will deteriorate.
Is bonito del norte belly the same as bluefin tuna belly?
No, they are different species. Bonito del norte (Thunnus alalunga) is smaller and its belly is more delicate and mild. Bluefin tuna (Thunnus thynnus) produces a fattier, more intense, and more expensive belly. Both are excellent, but they are distinct taste experiences.
Is it healthy to eat tuna belly?
It consists of fillets with a gelatinous texture and intense flavor. Rich in high biological value proteins and fatty acids with beneficial properties for cardiovascular health.
What is the tastiest part of tuna?
Ventresca: the most valuable and tastiest part. Tuna belly, also called flank, comes from the fish's belly. It is the fattiest area, and its texture is especially tender and buttery. For these qualities, it is considered: The juiciest part of the tuna.
Buy premium tuna and bonito belly at Bacalalo.
→ Prepare it with Bacalalo products: Olasagasti Bonito del Norte Belly | BayMar Clearfin Tuna Belly 1kg
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