Prawns, scallops, squid, lobster or octopus came out rubbery
Overcooked by a margin measured in tens of seconds. These are the narrowest cooking windows in the catalogue, and the two families get there by different mechanisms.
Work out which one it is
Each cause below lists the signs that point at it rather than at the others. Start with the signs, not with the fix.
It was octopus, and it went on the grate raw. This one is not an overcooking failure at all — it is the opposite.
occasionalSigns it is this one
- It is octopus, and it went on raw rather than already cooked.
- It was tough from the first minute rather than becoming tough.
- Longer on the grill made no difference, or made it worse.
Why it happens: Everything else in this problem goes tough because it was cooked too long: prawn, scallop and squid protein contracts and squeezes out its water, and the fix is less heat and less time. Octopus fails the other way. Its muscle carries a great deal of collagen, and collagen does not soften over dry radiant heat at any duration — it needs long, wet, gentle cooking to convert, which is the same mechanism as a brisket and nothing a barbecue can supply. So raw octopus put straight on a grate comes off inedible, and adding grill time makes it worse rather than better. A grate is where an octopus is finished, not where it is cooked.
What to do
- Nothing on the barbecue recovers it. The conversion that was needed cannot happen over dry heat. — during cook, cannot be recovered
- Simmer it until a knife goes into the thickest part of a tentacle without resistance, then grill for a few minutes a side for char. Buying it ready-cooked does the same job — most octopus is sold that way. — next time, reliable
Next time
- Treat the grill as the last three minutes of an octopus rather than the whole of it. BBQHQ holds no source for how long the simmering takes and publishes no figure for it; the test is the knife, not the clock.
A prawn or scallop passed its window while it was being watched.
commonSigns it is this one
- The flesh is opaque all the way through and springs back hard.
- They were left on while something else was attended to.
Why it happens: A scallop is one muscle with very little connective tissue, so it goes from translucent to firm to rubbery over a short span with no forgiving middle. The FSA's cue — firm and opaque — is the whole of the useful guidance, and it is more use than any duration because the difference between right and wrong depends entirely on the heat of the fire.
What to do
- Nothing rescues an overcooked scallop. Take the rest off at firm and opaque. — during cook, cannot be recovered
- Cook them shell-on where the food allows it; the shell insulates and widens the window considerably. — next time, partial
Next time
- Stand over them. This is not a food that tolerates a distraction.
The squid was on long enough for its collagen to tighten and not long enough for it to break down.
commonSigns it is this one
- The squid was on for more than a few minutes.
- It is uniformly tough rather than tough in patches.
Why it happens: Squid muscle is bound by collagen that toughens quickly on heating and then, given long enough, breaks down again. Only the first path is available on a barbecue: a couple of minutes over a fierce fire, off before the collagen has time to seize. The long braise that produces the other result is not live-fire cooking.
What to do
- There is no route back on a grill — the second tender state needs a long wet cook a barbecue cannot give it. — after cook, cannot be recovered
- Very hot fire, very short cook, and off before it curls tight. — next time, reliable
Next time
- Treat squid as a two-minute food or do not grill it at all.
What this covers
This is BBQHQ’s diagnosis for it came out tough, on the foods below.