How to Dice an Onion

Knowing how to dice an onion properly is one of the most fundamental knife skills you can learn! There are nearly endless diced onion recipes out there because onions add such great flavor, color, texture, and nutrition to a wide range of dishes!

We have been teaching this culinary skill for YEARS and have found that this is the easiest way to dice an onion.

Here are the steps to diced onion success:

Start with a sharp knife to help you dice an onion without crying. We’ve also heard that running tap water, holding a toothpick or unlit match between your teeth, or refrigerating the onion before cutting  also help, but some onions are just pungent and nothing seems to work! If you are really sensitive, you might look into buying onion goggles – yes they are a real thing!

Using a proper knife hold and a secure cutting board, chop off the stem end and trim the root end, removing the hairy fibers.

Place the onion on the flat stem end and slice in half from top to bottom. Peel.

Lay an onion half on the cutting board. Onions have natural lines; use these lines as a guide to help create even slices. Space out your cuts based on the size dice you need. Don’t slice all the way through to the root end.

Once you reach the end, rotate the onion 90º and chop. For large dice onion pieces, space slices out farther. For finely diced onion pieces, make thin slices in both directions.

Voila! You’ve learned how to dice an onion – easy!

Once you learn how to dice an onion like a chef, not only will you feel more confident in the kitchen, but you’ll surely impress your friends at your next dinner party!

After you master this skill, learn how to slice, chop, and mince garlic to add even more flavor to your dishes!

Leave a comment below, tag us on social media @to_taste, or send us a photo at so that we can share your culinary creations!

This Post Has 2 Comments

  1. Maneck+j+Bharucha

    It was easy but the knife has to be sharp 👍🏾Information was delivered very well

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