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What tuna to buy for grilling
Not all tuna works for grilling. You need a piece with enough fat to keep the inside juicy while the outside sears.
Bluefin Tuna (Thunnus thynnus): The premium option. The intramuscular fat makes it almost impossible to dry out if you respect the cooking times. Price: 35-80 €/kg depending on the cut. For a special dinner, it's worth the investment.
Yellowfin Tuna (Thunnus albacares): The realistic option for everyday. Less fat than bluefin but works perfectly grilled if you don't overcook it. Price: 15-25 €/kg. This is what you'll find in most fish markets.
Albcore Tuna (Thunnus alalunga): A good option, with lighter meat and milder flavor. Medium fat content. Works well grilled but is more delicate — it dries out faster than bluefin. Price: 10-18 €/kg in season.
What NOT to use: Poorly defrosted frozen tuna (releases water, doesn't sear), thin tuna fillets (< 2 cm — overcooks in seconds), brown tuna (oxidized, not fresh).
How to choose it: Fresh, quality tuna has an intense and uniform red color (not brown or spotted). The flesh is firm and elastic. It smells like clean sea, not fishy. If your fishmonger lets you choose the piece, ask for the center of the loin — that's where the fat is most balanced.
Ideal thickness: the variable everyone ignores
The thickness of the steak determines the final result more than any other factor. A 1 cm thick tuna will overcook in 30 seconds; a 4 cm thick one allows for a crispy sear with a completely raw interior.
| Thickness | Result | Difficulty | Recommendation |
|---|---|---|---|
| 1-1.5 cm | Cooked through — no pink point | Very easy to overcook | Only if you want it well done |
| 2-2.5 cm | Seared exterior, pink strip inside | Ideal for beginners | Recommended |
| 3-3.5 cm | Seared + large raw center | Requires timing control | For tataki and sashimi-style |
| 4+ cm | Mostly raw with exterior sear | Pro | Restaurant/sashimi |
The perfect size for home: 2.5 cm. It gives you a margin of error — even if you overcook by 15 seconds, the center will still be pink. Ask your fishmonger to cut steaks of that exact thickness.
The perfect sear: exact timings
Preparation (10 min before):
- Take the tuna out of the fridge 10-15 minutes before. It should be close to room temperature.
- Pat dry with paper towels — the surface must be completely dry.
- Brush with a minimal layer of mild olive oil (not EVOO — it smokes).
- Coarse salt just before placing on the grill — 5 seconds before, no more.
Cooking:
- Cast iron griddle on maximum heat for 5 minutes. It must be smoking.
- Place the steak. DO NOT TOUCH IT.
- Side 1: 60-90 seconds. You'll see the cooking line rise from the bottom.
- Flip ONLY once with tongs (not a fork — it punctures and loses juices).
- Side 2: 60-90 seconds.
- Edges (optional): If the steak is thick (3+ cm), sear the edges for 10-15 seconds each, holding with tongs.
- Remove to a warm plate. Rest for 1-2 minutes. Slice and serve.
| Desired doneness | Thickness 2.5 cm | Interior | Internal Temp. |
|---|---|---|---|
| Blue | 45 sec + 45 sec | 90% raw, red | 30-35 °C |
| Rare | 60 sec + 60 sec | 70% pink | 40-45 °C |
| Medium-rare | 90 sec + 90 sec | 50% pink center | 48-52 °C |
| Medium | 2 min + 2 min | Barely pink | 55-60 °C |
| Well done | 3 min + 2 min | White, dry | >60 °C — Not recommended |
The optimal doneness is "medium-rare": golden and crispy exterior with grill marks, translucent pink interior with an almost creamy texture. Anything more cooked starts to lose juices and flavor.
3 quick marinades (15-30 minutes)
1. Asian (soy-sesame): 3 tbsp soy sauce, 1 tbsp sesame oil, 1 tbsp mirin (or honey), 1 grated garlic clove, grated fresh ginger. Marinate for 15-20 minutes (no more — soy sauce "cooks" the surface). Sprinkle black sesame on top when serving.
2. Mediterranean (lemon-herb): Juice of half a lemon, 3 tbsp EVOO, 1 crushed garlic clove, fresh thyme and rosemary, black pepper. Marinate for 20-30 minutes. Works especially well with albacore tuna.
3. Spicy (sriracha-lime): 2 tbsp sriracha, juice of one lime, 1 tbsp honey, 1 tbsp sesame oil, chopped cilantro. Marinate for 15 minutes. Aggressive and addictive — ideal for those who want something different.
Marinade rule: Never more than 30 minutes. Acids (soy, lemon, lime) denature the surface protein. More than 30 minutes and the exterior texture becomes soft and the sear won't work.
If you prefer ready-to-eat tuna, our canned tuna and albacore in EVOO are the gourmet alternative — whole loins, sustainably caught, no fuss.
3 sauces that truly work with grilled tuna
1. Homemade ponzu sauce: 3 tbsp soy sauce, 2 tbsp lemon juice, 1 tbsp mirin, 1 tbsp dashi (or concentrated fish stock). Mix cold. The acidity of ponzu perfectly cuts through the tuna's richness. Ideal with bluefin tuna.
2. Sesame and wasabi sauce: 3 tbsp tahini, 1-2 tsp real wasabi (not green coloring), 1 tbsp soy sauce, water to thin the texture. Creamy, spicy, and deep. Works as a dipping sauce for the slices.
3. Tomato and anchovy vinaigrette: Tomato concassé (peeled, deseeded, diced), 2 chopped anchovy fillets, 3 tbsp EVOO, 1 tbsp sherry vinegar, capers. The umami of anchovy elevates the tuna. 100% Mediterranean.
Sides that complement without competing
- Wakame salad: Hydrated wakame seaweed, cucumber, sesame, rice vinegar dressing. Fresh and light, perfect contrast with grilled fish.
- Edamame: Boiled with coarse salt. Protein + protein, but works as an appetizer while the tuna rests.
- Sweet potato purée: Sweetness that contrasts with the tuna's umami. Roast at 200 °C for 45 min, mash with butter and salt.
- Grilled vegetables: Green asparagus, zucchini, eggplant — on the same grill after the tuna, taking advantage of the juices.
- Sushi rice: Japanese rice with rice vinegar, sugar, and salt. Transforms grilled tuna into an Asian-inspired dish.
The 7 mistakes that ruin grilled tuna
- Overcooking it. By far the number one mistake. Overcooked tuna is dry, fibrous, and loses all its appeal. The inside MUST be pink.
- Cold grill. If the grill isn't smoking, it's not ready. Preheat for 5 minutes on maximum heat. Searing only works with extreme heat.
- Too thin a piece. Less than 2 cm won't allow for a seared exterior and pink interior. Ask the fishmonger for a minimum of 2.5 cm.
- Not drying the surface. Moisture prevents the Maillard reaction. No sear means no flavor. Dry with paper towels obsessively.
- Moving the piece. Place it and don't touch it until it's time to flip. Every movement tears off the crust that's forming.
- Marinating too long. More than 30 minutes with acids (soy, lemon) and the surface "cooks," preventing a proper sear.
- Cutting without resting. 1-2 minutes of resting allows the juices to redistribute. If you cut immediately, the juices will run onto the plate.
Keep exploring
Parts of tuna: all cuts · Properties of tuna · Grilled fish: technique and times · Canned tuna and albacore
Frequently asked questions
How long do you cook grilled tuna?
For a 2.5 cm steak: 60-90 seconds per side for medium-rare (pink interior). 45 seconds per side for blue. 2 minutes per side for well done (not recommended — it will be dry). The grill should be at maximum temperature.
Can you eat grilled tuna pink in the middle?
Yes, and it's the correct way to eat it. Grilled tuna should have a translucent pink/red interior. It's like a steak — the optimal doneness is medium-rare. Make sure the tuna has been previously frozen to -20 °C for 5 days if you buy it fresh (due to anisakis).
What type of tuna is best for grilling?
Bluefin tuna is premium (more fat, more flavor). Yellowfin tuna is the practical option — it works perfectly if you don't overcook it. Look for a cut from the center of the loin, 2.5 cm thick, with an intense and uniform red color.
Do you have to marinate tuna before grilling?
It's not mandatory — quality tuna only needs salt and a good grill. But a 15-20 minute marinade with soy and sesame, or lemon and herbs, adds another dimension. Never more than 30 minutes — acids soften the surface.
Can you grill frozen tuna?
Not directly. Defrost in the refrigerator for 12-24 hours, pat very dry, and then grill. Frozen tuna releases water, which prevents searing. Exception: Japanese tataki steaks are designed to be seared semi-frozen (hot exterior, icy center).
Why is my grilled tuna dry?
Overcooking (>2 minutes per side on a 2.5 cm piece), too thin a piece (<2 cm), or low-quality tuna (low fat). Solution: thicker piece, less time, hotter grill.
