Blanching

The first step in blanching green beans

Blanching (also spelled blenching) is a cooking term that describes a process of food preparation where in the food substance, usually a vegetable or fruit, is plunged into boiling water, removed after a brief, timed interval and finally plunged into iced water or placed under cold running water (shocked) to halt the cooking process.

Uses of blanching

• Peeling Blanching loosens the skin on some fruits or nuts, such as onions, tomatoes, plums, peaches, or almonds.
• Flavour Blanching enhances the flavor of some vegetables, such as broccoli, by releasing bitter acids stored in the food.
• Appearance Blanching enhances the color of some (particularly green) vegetables by releasing gases trapped in the food that obscure the greenness of the chlorophyll. Since blanching is done quickly, the heat does not have time to break down chlorophyll as well.
• Shelf life Blanching neutralizes bacteria and enzymes present in foods, thus delaying spoilage. This is often done as a preparatory step for freezing and refrigerating vegetables.

Blanching can also describe deep frying in oil at a lower temperature as with the initial cooking of chips.

Blanching also weakens the structure of vegetables, rendering them softer than fresh. This is beneficial for canning vegetables, a process wherein the air in vegetables needs to be minimal.

See also

Food portal

• Parboil

References

• Desrossier, NW, The technology of food preservation, The AVI Publishing Company, 1965, p. 150-151

External links

Wikibooks Cookbook has a recipe/module on Blanching

• Free Culinary School Podcast Episode 3A podcast discussing the importance of blanching and the science behind the technique.