Comparisons · Two cuts
King prawns in the shell or Mussels in the shell
Both arrive in a shell and only one of them tells you when it is done by opening. That difference is a safety difference rather than a convenience, and it is where the two records genuinely diverge.
What each one is
King prawns in the shell
Prawns grilled in their shells, which insulate the flesh and hold moisture in. The FSA's cue is firm and opaque flesh rather than a temperature.
Mussels in the shell
Cooked in the shell directly over the fire until the shells open. The FSA is explicit that any that do not open should be thrown away.
Where they overlap
- Both are the same food form, so the same safety rules apply to each.
What actually differs
| Aspect | King prawns in the shell | Mussels in the shell |
|---|---|---|
| Typical weight | 20–35 g | 15–30 g |
| Where the safety line falls Form governs the endpoint, not species. Two cuts off the same animal can sit on opposite sides of this line. | shellfish is done when the flesh is firm and opaque | mussels, clams and oysters must open, and the closed ones are thrown away |
| What tends to go wrong From BBQHQ's troubleshooting index. Choosing between two cuts is partly choosing which failure you would rather risk. | came out tough | still raw in the middle |
Can one stand in for the other?
Swap it straight across
On every axis BBQHQ models — anatomy, thickness, bone, safe endpoint and the cooking windows in the evidence — these two behave the same way. What differs between them is flavour and fat, which BBQHQ does not model and will not guess at.