How to Cut Onions Without Crying: Expert Tips and Tricks
Chopping onions is an essential skill in the kitchen, but it often comes with an unpleasant side effect: tears. The irritation and burning sensation in your eyes while cutting onions are caused by a sulfur-containing compound called syn-Propanethial-S-oxide, which is released when the onion’s cells are broken open. This compound vaporizes into the air, causing your eyes to produce tears as a defense mechanism. But fear not! You don’t have to endure the discomfort of watery eyes when chopping onions. There are several techniques and tips that can help you cut onions without crying. In this article, we’ll share expert methods to reduce or eliminate eye irritation, so you can slice and dice with ease.
Why Do Onions Make You Cry?
Before exploring solutions, it’s important to understand why onions cause tears in the first place. When you cut an onion, its cells are broken, releasing an enzyme called alliinase. This enzyme reacts with sulfur compounds in the onion to produce sulfuric acid, which then evaporates and irritates the tear ducts in your eyes. The irritation triggers your eyes to produce tears to flush out the irritant.
Methods to Cut Onions Without Crying
Here are some expert tips and techniques that can help you prevent tears while chopping onions:
1. Use a Sharp Knife
A sharp knife can significantly reduce the amount of irritation you experience while cutting onions. When you use a dull knife, it crushes and bruises the onion cells, releasing more of the sulfur compounds into the air. A sharp knife, on the other hand, makes cleaner cuts, which reduces the release of these irritating compounds.
Tip:
Invest in a high-quality, sharp kitchen knife to make precise cuts that minimize cellular damage.
2. Chill the Onion Before Cutting
One of the easiest and most effective methods to reduce crying is to chill the onion before cutting it. Cold temperatures slow down the release of the sulfur compounds, making them less volatile and reducing their impact on your eyes.
How to do it:
- Place the onion in the fridge for about 30 minutes before you plan to cut it. Alternatively, you can freeze the onion for 10 to 15 minutes.
- Chilled onions will release fewer irritants, and your eyes will remain dry.
3. Cut the Root Last
The root end of the onion contains the highest concentration of sulfur compounds. By cutting the root last, you minimize exposure to these compounds, reducing the chance of irritation. It’s the part of the onion that causes the most tears, so saving it for the end can help keep your eyes comfortable.
How to do it:
- First, cut off both ends of the onion.
- Peel off the outer skin and cut the onion in half from top to bottom.
- Slice the onion from the top to the root, leaving the root end intact until the very end.
4. Use a Ventilation Method
Increasing airflow in the kitchen can help dissipate the sulfuric compounds released by the onion. By using ventilation, you can reduce the concentration of irritating gases in the air and prevent them from reaching your eyes.
How to do it:
- Cut onions near an open window or use a fan to blow the onion vapors away from your face.
- Alternatively, you can cut onions near an exhaust fan or range hood to help pull the fumes away.
5. Cut Under Water
Cutting onions under water is an old-school method that can help keep tears at bay. By doing this, the sulfuric compounds are trapped in the water rather than being released into the air.
How to do it:
- Fill a large bowl with water and place the onion in the water.
- Cut the onion in the water, ensuring that the cutting area is submerged.
- Be cautious when handling sharp knives in water to avoid accidents.
6. Use Goggles or a Face Shield
For those who are particularly sensitive to onion vapors, wearing goggles or a face shield is a guaranteed way to protect your eyes from irritation. The protective eyewear creates a seal around your eyes, preventing the sulfuric acid from reaching them.
How to do it:
- Wear a pair of airtight goggles or a face shield while chopping onions.
- This method is highly effective but may not be the most practical for everyday use.
7. Use a Food Processor or Onion Chopper
If you find that slicing onions by hand consistently leads to tears, consider using a food processor or onion chopper. These kitchen gadgets can quickly chop onions without exposing your eyes to the sulfur compounds.
How to do it:
- Simply place the onion in the food processor or onion chopper and pulse until finely chopped.
- This method reduces the time your eyes are exposed to the onion’s fumes.
8. Soak the Onion in Water
Soaking the onion in water before cutting it helps reduce the release of sulfur compounds. Soaking also softens the onion, which may make it easier to cut.
How to do it:
- Peel the onion and place it in a bowl of cold water for 10 minutes before cutting.
- The water will help dissolve some of the sulfur compounds, preventing them from vaporizing into the air.
9. Chew Gum or Suck on a Piece of Bread
Although it might sound unusual, chewing gum or sucking on a piece of bread while cutting onions can help reduce tears. This technique works because it encourages you to breathe through your mouth rather than your nose, which limits the amount of sulfuric compounds that enter your eyes.
How to do it:
- Chew a piece of gum or place a slice of bread in your mouth while chopping onions.
- This may help you avoid the usual discomfort and tears.
10. Try Special “Tear-Free” Onions
There are now varieties of onions available in the market that are specifically bred to reduce the release of sulfuric compounds. These onions are often referred to as “tear-free” or “low-sulfur” onions. They may not be entirely free from the potential to make you cry, but they are much less irritating than regular onions.
How to do it:
- Look for varieties such as Sweet Onions, Gem Onions, or Tearsless Onions at your local grocery store.
- These types of onions are a great alternative if you’re particularly sensitive to traditional ones.
Conclusion
Cutting onions doesn’t have to result in a tear-filled experience. By employing a few simple tricks, you can make onion chopping a more comfortable task. From chilling the onions and using sharp knives to wearing protective goggles and trying tear-free varieties, there are plenty of methods to suit your preferences. The next time you’re preparing a meal that requires onions, put these techniques to the test and enjoy hassle-free chopping.
No more watery eyes or stinging discomfort—just perfectly chopped onions for your favorite recipes!

