When it goes wrong · Blanch
Tomatoes are cooked and mushy rather than just peelable.
Can you save it?
Reviewed for this symptom
Peel them and cook them on — they are fine in a sauce, soup or braise, just not raw. Blanch new tomatoes for a salad, and count to twenty.
How to confirm the diagnosis
Observable cues, not inferred user state
- The flesh under the skin is soft and pale
- They stayed in the water for over a minute
- They were meant for a raw dish
Not this?
- Vegetables are olive green and limp.
- Blanched vegetables kept cooking and went soft.
- Frozen vegetables taste stale and off after a few months.
What actually happened
Only this symptom
Far too long. Blanching for skins is measured in seconds, not minutes.
The full mechanism
Shared by every blanch failure
Blanching does several unrelated jobs and it is worth knowing which one you are doing. It sets green colour: brief heat drives out the gas trapped between cell walls that dulls chlorophyll, so the green brightens — and prolonged heat then degrades that same chlorophyll to olive, which is why the window is short. It deactivates enzymes, particularly the ones responsible for off-flavours and texture loss in frozen vegetables, which is why blanching before freezing genuinely matters. It loosens skins on tomatoes, peaches and almonds by expanding the flesh just beneath and breaking the bond. And it removes harshness from bitter greens and raw onion. The ice bath is not optional in most of these — residual heat keeps cooking the vegetable for minutes, and without shocking, a perfectly blanched vegetable overcooks in the colander.
The full Blanch lesson — how to tell, where to practise it, what it carries to.
Next time
Prevent this specific failure
Score, fifteen to thirty seconds in boiling water until the cut edges curl, then iced water immediately.
What right looks like
Shared by every blanch failure
- Green vegetables go visibly brighter within thirty to sixty seconds. That flash of colour is the endpoint for colour-setting.
- Scored tomato skins curl back at the cut, usually in fifteen to thirty seconds.
- The water should return to a boil quickly; if it does not, too much has gone in at once.
- After shocking, the vegetable is cold all the way through — not cool on the outside.