Blanching

Definition

Brief immersion of food in boiling water followed by rapid cooling in ice water. Inactivates enzymes, preserves color, and facilitates peeling.

How it works

Blanching involves two steps: brief exposure to boiling water (30 seconds to 5 minutes) followed by immediate submersion in ice water to stop the cooking process. This technique inactivates enzymes responsible for browning and texture degradation, making it essential before freezing vegetables. The process also helps remove skins from certain foods like tomatoes and almonds, and enhances color retention in frozen vegetables.

Role

Preserves color, texture, and nutritional quality by enzyme inactivation while preparing food for freezing or further processing.

Examples

• Blanched broccoli before freezing
• Blanched tomatoes for peeling
• Blanched green beans
• Blanched almonds
• Blanched carrots

Recommendations

Use 3-5 minutes for leafy greens, 3-4 minutes for vegetables. Immediately ice-bath to prevent overcooking. Drain thoroughly before freezing to prevent ice crystal formation.

Key takeaway

Blanching preserves frozen vegetable quality by deactivating degradative enzymes.

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