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 Justin Goolsby

Justin builds SummitPlate and writes from the product's practical focus: calmer family dinner planning, grocery lists that match real stores, ingredient overlap, and less food wasted after the shopping trip.

Related Content

Techniques

How to Caramelize Onions

Equipment

How to Sharpen a Knife at Home

Guide

Meal Planning for Beginners

Ready to Put Your Skills to Work?

SummitPlate creates meal plans that use every ingredient — so your family eats well and nothing goes to waste.

Try SummitPlate Preview →