Cooking Techniques

How to Properly Dice an Onion: Step-by-Step Guide

Quick take: Consistent onion dicing requires proper technique: halve, slice crosshatch, and chop downward for uniform pieces.

1. Halve the onion from root to tip. Leave the root intact—it holds layers together.

2. Slice lengthwise from root to tip, cutting almost to the bottom but not through.

3. Make a horizontal cut about halfway up the onion (optional, for very fine dice).

4. Chop downward with your knife, guiding with your fingertips curled under (claw grip).

Pro tips: Chill onions 30 minutes before cutting to reduce eye-burning. A sharp knife crushes cells less, releasing fewer irritants.

Dice sizes: Small (⅛-inch), Medium (¼-inch), Large (½-inch)

Frequently Asked Questions

What's the fastest way to dice an onion?

Halve from root to tip (keep root intact), make lengthwise cuts, one horizontal cut, then chop downward. The intact root holds layers together for uniform pieces.

How do you stop crying when cutting onions?

Chill onions 30 minutes before cutting to reduce the release of irritating compounds. A sharp knife also crushes fewer cells, releasing fewer irritants.

What are the standard dice sizes?

Small dice is ⅛-inch, medium dice is ¼-inch, and large dice is ½-inch. Most recipes calling for 'diced onion' mean medium (¼-inch).

SP

Written by the SummitPlate Team

Our team combines nutritional science and AI technology to help families eat better and save money. SummitPlate's meal plans are designed using USDA nutritional guidelines and optimized to reduce food waste through smart ingredient overlap.

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