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


Onions are an essential ingredient in many dishes, from soups and stews to stir-fries and salads. However, dicing an onion can be a daunting task for many home cooks, resulting in uneven chunks, tears, and frustration. In this article, we’ll provide you with a step-by-step guide on how to dice an onion like a pro, so you can save time and effort in the kitchen and add a perfect dice to your dish every time.

Before we get started, it’s important to note that there’s no one-size-fits-all approach to dicing an onion. Different recipes may require different sizes and shapes of onion chunks, and personal preferences can also come into play. However, we’ll provide you with a basic technique that can be adapted to different needs and demonstrate how to achieve a fine, evenly sized dice.

So, whether you’re a beginner who’s never diced an onion before or an experienced cook looking to sharpen your skills, read on to learn how to dice an onion like a pro!

Before You Begin

Before we dive into the dicing process, here are a few things to keep in mind:

Item Description
Onion Choose a firm, round onion with a dry, papery skin. Avoid onions that are soft, bruised, or have sprouts.
Knife Use a sharp knife, preferably a chef’s knife or a santoku knife, for a clean and easy cut. Avoid serrated knives, which can crush the onion and cause uneven dicing.
Cutting Board Use a stable cutting board that won’t slip or move around. Ideally, choose a wooden or plastic board, which won’t damage your knife.
Method Decide which dicing method you prefer: horizontal, vertical, or a combination of both. We’ll demonstrate the horizontal method in this article, but feel free to experiment with different techniques.

Step-by-Step Guide

Now that you’re equipped with the right tools and knowledge, let’s get started with the dicing process:

Step 1: Cut off the Ends

Using a sharp knife, cut off the stem and root ends of the onion. This will create a flat surface on both sides and make it easier to peel the onion.

Step 2: Peel the Onion

Remove the dry, papery skin of the onion by gently pulling it off with your fingers. If the skin is hard to remove, use a knife to make a shallow cut along the skin and peel it off in sections.

Step 3: Cut the Onion in Half

Place the onion on one of its flat sides and cut it in half from top to bottom with a straight down motion of the knife.

Step 4: Make Horizontal Cuts

Place one half of the onion on the cutting board with the cut side facing down. Use your non-dominant hand to hold the onion in place and make horizontal cuts across the onion with your dominant hand. The size of the cuts will depend on how fine you want your dice to be, but aim for slices that are half the diameter of the onion. Don’t cut all the way to the root end, leave about 1/2 inch uncut.

Step 5: Make Vertical Cuts

Keeping the onion together, make vertical cuts from the top of the onion to the root end. Again, the size of the cuts will depend on your preference, but aim for slices that are roughly the same width as your horizontal cuts. Don’t cut all the way to the root end, leave about 1/2 inch uncut.

Step 6: Make Final Cuts

Finally, turn the onion 90 degrees and make downward vertical cuts through the onion, starting from the top and working your way towards the root end. The cuts should be perpendicular to your previous cuts and roughly the same width as your previous cuts. As you cut through the onion, the pieces will fall away and create a perfect dice.

Step 7: Repeat on the Other Half

Repeat the same dicing process on the other half of the onion until you have a pile of evenly sized pieces. If some of the pieces are too large or uneven, you can go back and re-cut them.

Tips for Success

Here are a few tips to help you achieve a perfect dice:

  • Make sure your knife is sharp and well-maintained.
  • Use a gentle, fluid motion when cutting the onion, rather than a chopping motion.
  • Avoid squeezing the onion or applying too much pressure, which can cause uneven dicing or crush the onion.
  • Practice makes perfect – the more you dice onions, the easier it will become!


Q1: Can I use a food processor to dice an onion?

A: Yes, you can use a food processor with the appropriate blade attachment to dice an onion quickly and easily. However, keep in mind that the resulting pieces may not be as evenly sized or consistent as hand-diced onion.

Q2: How do I avoid crying while dicing an onion?

A: There are several tricks you can try to reduce tears while dicing an onion, such as chilling the onion in the fridge before cutting, cutting the onion under running water, or wearing goggles or glasses to protect your eyes.

Q3: How long will diced onion last in the fridge?

A: Diced onion can last for 3-5 days in the fridge if stored in an airtight container or wrapped tightly in plastic wrap.

Q4: Can I use a different type of onion for dicing?

A: Yes, you can use different varieties of onion for dicing, such as red onion, white onion, or shallots. Keep in mind that different varieties may have different flavors and textures, so adjust accordingly.

Q5: Do I have to follow the horizontal and vertical method?

A: No, the horizontal and vertical method is just one way to dice an onion. Feel free to experiment with different methods and techniques to find one that works best for you.

Q6: Can I dice an onion without cutting off the ends?

A: It’s best to cut off the ends of the onion before dicing to create a stable surface and make it easier to peel. However, if you’re in a hurry or don’t mind uneven pieces, you can skip this step.

Q7: How do I dice an onion into wedges?

A: To dice an onion into wedges, cut off the stem and root ends of the onion, peel it, and cut it in half from top to bottom. Cut each half into 3-4 wedges, depending on the size of the onion, and remove the tough core from each wedge. You can then slice each wedge into smaller pieces if desired.


Congratulations! You’ve now mastered the art of dicing an onion like a pro. By following our step-by-step guide, you can achieve a perfect, evenly sized dice every time, and add a delicious flavor and texture to your dishes. Remember to choose a firm, round onion, use a sharp knife and stable cutting board, and practice gentle, fluid cuts for best results.

Don’t be afraid to experiment with different dicing methods and techniques, as each cook has their own style and preferences. And if you ever feel frustrated or overwhelmed, just remember that with practice and patience, you too can become a dicing pro.

Take Action Today!

Now that you’ve learned how to dice an onion like a pro, it’s time to put your skills to the test. Try dicing an onion for your favorite dish and see how it enhances the flavor and presentation. Share your success with your friends and family and encourage them to try it too!

Closing Disclaimer

The information provided in this article is intended for educational and informational purposes only. Always exercise caution and follow proper safety procedures when handling sharp knives and other kitchen tools. Consult with a professional if you have any concerns or questions about your specific situation.

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