When it goes wrong · Steam
Unevenly cooked, some pieces raw.
Can you save it?
Reviewed for this symptom
Take the cooked pieces out, spread the raw ones in a single layer and steam them on for a few more minutes; combine at the end.
How to confirm the diagnosis
Observable cues, not inferred user state
- Cooked outside pieces and raw middle ones
- The basket was packed deep
- No gaps between pieces
Not this?
- The pan boiled dry and scorched.
- Vegetables are drab and soft.
- Nothing browns and the dish tastes flat.
What actually happened
Only this symptom
Piled too deep. Steam has to circulate; a packed basket cooks the outside and leaves the middle.
The full mechanism
Shared by every steam failure
Steam is water vapour at 100°C, and it carries a great deal of energy — when it condenses on cooler food it releases its latent heat of vaporisation, which is far more than the same mass of hot water would give up. That makes steaming surprisingly fast despite feeling gentle. Because the food is never submerged, water-soluble vitamins, sugars and flavour compounds stay in it rather than leaching into a pot of water that gets poured away, which is why steamed vegetables taste more strongly of themselves than boiled ones. The other property that matters is that steam finds its way into gaps: a covered pan with a splash of water drives heat into places dry heat cannot reach, which is why a thick vegetable stem, a bao, or a grilled cheese sandwich all benefit from a brief covered moment.
The full Steam lesson — how to tell, where to practise it, what it carries to.
Next time
Prevent this specific failure
One layer with gaps, or steam in batches, so the steam can circulate.
What right looks like
Shared by every steam failure
- Steady steam escaping around the lid, not violent jets — a hard boil underneath adds nothing and empties the pan.
- Green vegetables brighten within the first minute or two; that is the moment they are at their best and it passes quickly.
- A skewer meets no resistance, which is the only doneness signal, since nothing browns.
- The water underneath never touches the food. If it does, this is boiling.