Foods & cuts · Tuna

Tuna steak

A dense steak of dark muscle, very commonly served rare in the middle — which puts the culinary endpoint and the safety endpoint further apart than for any other fish.

What it is

Form: Steak
Typical weight: 150–250 g
Typical thickness: 20–30 mm
Cut: Not a cut of anything

Why it behaves as it does

Tuna is the clearest case in the catalogue of two endpoints that must not be conflated. The FSA's fish guidance is that the flesh should turn opaque and separate easily with a fork; a tuna steak served the way most restaurants serve it is deliberately not opaque in the middle. BBQHQ states both and does not resolve them, because the resolution is a decision a reader makes and not a fact BBQHQ holds. Its density also means it goes from rare to dry in under a minute either side of the window.

When is it done?

Food-safety endpoint

Food Standards Australia New Zealand
FSANZ states that steaks can be cooked to preference, in the same guidance that requires chicken, sausages and hamburgers to reach 75 °C. No temperature is attached to the steak case.
The rule and its source
Across Australia and New Zealand, FSANZ advises cooking chicken, sausages and hamburgers thoroughly to an internal temperature of 75 °C, while stating that steaks may be cooked to preference.
Well established
- Food Standards Australia New Zealand — States this directly
  “Cook chicken, sausages and hamburgers thoroughly, to an internal temperature of 75oC - check the temperature with a food thermometer.”
  Where it applies:
  Australia and New Zealand together. FSANZ's remit is bi-national, which is why a New Zealand reader is covered by this AND by MPI.
  Form:
  Names chicken, sausages and hamburgers — poultry plus the two commonest minced forms.
  Method:
  Stated in the context of sausage sizzles and barbecues specifically.
  About this source · Original · retrieved 2026-08-13
- Food Standards Australia New Zealand — States this directly
  “Steaks can be cooked to preference”
  A regulator saying explicitly where its own rule stops. Most authorities leave this to be inferred; FSANZ writes it down.
  Form:
  The distinction is FORM, not species: the same animal appears on both sides of the sentence.
  About this source · Original · retrieved 2026-08-13
Food Standards Australia New Zealand
Use separate equipment for raw and cooked meat, and never put cooked meat back on a tray or plate that held it raw. Throw away leftovers unless there is refrigeration available to cool them quickly.
The rule and its source
At a barbecue, raw and cooked meat must be kept apart: separate equipment, and cooked meat never returned to the tray that held it raw.
Well established
- Food Standards Australia New Zealand — States this directly
  “never place cooked meat back on the trays that held the raw meat”
  The single most common barbecue food-safety failure, and one that no cooking temperature prevents.
  Where it applies:
  Australia and New Zealand.
  About this source · Original · retrieved 2026-08-13
Food Standards Agency
In the UK, fish is cooked when the flesh has turned opaque — no longer transparent — and separates easily with a fork.
The rule and its source
In the UK, fish is cooked when the flesh has turned opaque and separates easily with a fork. The regulator gives no temperature for fish.
Well established
- Food Standards Agency — States this directly
  “fish flesh should turn opaque (no longer transparent) and separates easily with a fork”
  How it was measured:
  A visual and textural test, not a thermometer reading. The same document gives 70 °C for 2 minutes as the general combination for food, and does not apply a figure to fish.
  Where it applies:
  England, Wales and Northern Ireland.
  About this source · Original · retrieved 2026-08-16
Food Standards Agency
Wash a thermometer stem in hot soapy water before and after each use, and do not put the head in water.
The rule and its source
A thermometer stem should be washed in hot soapy water before and after each use, and the head should not be put in water.
Well established
- Clemson Cooperative Extension — States this directly
  “Make sure to clean the stem of your food thermometer with hot soapy water before and after each use. Do not immerse the head in water.”
  Before and after, not just after. a probe that went into an undercooked bird and then into the next one is a cross-contamination route BBQHQ's food-safety model already recognises between surfaces and hands, and has never described for the instrument that touches every piece of meat on the grate.
  The head exclusion is an equipment instruction rather than a hygiene one — electronics — and is recorded here because it is in the same sentence and separating them would misquote the source.
  About this source · Original · retrieved 2026-08-21

Texture endpoint — how you actually know

Opaque through — which is not what everybody wants

Cooked through, tuna goes from deep red to uniform pale beige and firms considerably; the flesh flakes in dense sheets rather than the loose ones cod gives. READ THIS TARGET BEFORE THE WINDOW. Searing a tuna steak hard on both faces and leaving the centre raw is ordinary practice and produces a completely different food, and the six-to-twelve minutes above will not get you there — it is derived from a rule about cooking fish through. No publisher BBQHQ holds times a seared tuna steak, so BBQHQ does not either, rather than guessing at a figure for the cook most people are probably attempting.

Where this comes from

Fish is timed by thickness rather than by weight. Clemson gives ten minutes per inch at 450 °F in an oven, with five minutes added in foil or sauce and double for frozen fish; Weber gives 8–10 minutes per inch on a grill. Doneness is a physical signal — the flesh just begins to flake and loses its translucency.

Well supported

Clemson Cooperative Extension — States this directly
“bake for 10 minutes per inch thickness of the fish, turning the fish halfway through the cooking time”
Method:
Stated for baking at 450 °F, NOT for grilling. The oven is the assumed appliance.
How it was measured:
Measured at the thickest point, after stuffing or rolling if either applies.
Add 5 minutes if cooked in foil or in a sauce; double to 20 minutes per inch for fish cooked from frozen.
About this source · Original · retrieved 2026-08-13
Weber-Stephen Products LLC — States this directly
“General rule for grilling fish: 4 to 5 minutes per ½ inch thickness; 8 to 10 minutes per 1 inch thickness.”
Form:
Expressed per unit of thickness rather than per portion.
Close to but not identical with Clemson's 10-minutes-per-inch rule, which assumes a 450 °F oven rather than a grill.
About this source · Original · retrieved 2026-08-13
Clemson Cooperative Extension — States this directly
“Fish is cooked when its meat just begins to flake easily when tested with a fork and it loses its translucent or raw appearance.”
Form:
A physical signal rather than a temperature — the shape a texture endpoint takes.
About this source · Original · retrieved 2026-08-13

How long it takes

Tuna steak, direct heat

Estimated cooking window

6 min–12 min

Low confidence

Why this is a range, not a number

Thickness varies between pieces
Cookers hold temperature imperfectly
How cold the food was when it went on

Cook to the endpoint, not to the clock. The window tells you when to start checking.

What this rests on

BBQHQ publishes a window for this cook.

Observations: 2
Documents: 2
Publishers timing this cook: 2

Alaska Seafood Marketing Institute · Weber-Stephen Products LLC

Why confidence is not higher

The window is BBQHQ's arithmetic on a source's per-unit rate, not a window the source published.
At least one source does not state the cooker temperature.
No source states whether the food went on fridge-cold or rested.

How the sources were combined

THE WINDOW BELOW COOKS A TUNA STEAK THROUGH, AND THAT IS THE ONLY THING THE EVIDENCE DESCRIBES. Weber's fish rate sits in a section whose chart row covers 'fish fillet or steak', and ASMI's sits beside an instruction to cook until opaque throughout; multiplied across a 20-30 mm steak both give six to twelve minutes. What neither publisher addresses, and what nothing else in this catalogue addresses, is that a large share of the people asking how long to cook a tuna steak intend to sear it and leave the middle raw — a practice as mainstream for tuna as it is for beef and one BBQHQ holds no source for. So the number is published as what it is, a cook-through figure derived from a general fish rule, and the texture target says plainly that it is not the answer to a different question. What would let BBQHQ answer that one is recorded as an open question. The rate is the same one behind the cod fillet and the arithmetic is identical; tuna's difficulty is not its thickness.

What makes the window as wide as it is

Thickness varies between pieces
Cookers hold temperature imperfectly
How cold the food was when it went on

One open question tracked for this.

When it goes wrong

It came out dry: The fish came out dry — 2 distinguishable causes.

Afterwards

Cooling, keeping and reheating what is left is general guidance for barbecue leftovers. Neither UK authority publishes anything specific to tuna steak, and BBQHQ does not invent a distinction they do not make.