Rescues · TO STEAM
The pan boiled dry and scorched.
Why it happens
Not enough water for the time, or too hard a boil. Steaming is long enough that a small amount of water disappears.
Recovering it
Under-steamed is trivially fixed with more time. Over-steamed vegetables are best repurposed into a purée or a soup rather than served as they are. A scorched pan means starting the water again; the food above it is usually unaffected if caught quickly, though anything that has taken on a burnt smell will keep it.
The mechanism
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 TO STEAM lesson — how to tell, where to practise it, what it carries to.