What is blanching?
Blanching, in one line
Blanching means briefly boiling a food, usually for 30 seconds to 3 minutes, then cooling it fast in ice water to set its color and texture.
Why it works
A short dip in boiling water softens vegetable cell walls just enough and switches off enzymes that cause dull color and off flavors. Chlorophyll turns bright green in that quick heat. The ice bath, called shocking, stops the cooking at once so the vegetable stays crisp instead of turning mushy.
How to do it
Common mistakes
- Skipping the ice bath, which lets carryover heat keep cooking the vegetables.
- Using too little water, which stops the boil and extends the time.
- Blanching too long, which turns the vegetables soft and dull.
Questions about blanching
How long should you blanch green beans?
Blanch them for about 2 to 3 minutes until bright green and just tender. Then chill them right away.
Why do you shock vegetables in ice water?
Shocking stops the cooking right away, which locks in the bright color and crisp bite.
Do you have to blanch vegetables before freezing?
It is best to. Blanching stops enzymes that cause flavor and texture loss, so frozen vegetables taste fresher.
Broccoli
Green Bean
Peas
