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Home - Research - “It Didn’t Burn My Eyes!”: Scientists Finally Create a Real Tear-Free Onion That Keeps All the Taste Without the Crying

“It Didn’t Burn My Eyes!”: Scientists Finally Create a Real Tear-Free Onion That Keeps All the Taste Without the Crying

In a groundbreaking agricultural development, Bayer has introduced the "sunion," a revolutionary tear-free onion that promises to transform culinary experiences by eliminating the age-old problem of eye irritation when cutting onions.
Gabriel CruzGabriel Cruz07/16/20258
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Illustration of a tear-free sunion, a new variety of onion developed by Bayer, generated by artificial intelligence.
Illustration of a tear-free sunion, a new variety of onion developed by Bayer, generated by artificial intelligence.
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IN A NUTSHELL
  • 🧅 Sunions are a new variety of onion developed by Bayer to offer a tear-free cooking experience.
  • 🔬 Created through natural crossbreeding, sunions have reduced levels of propanthial-S-oxide, the compound responsible for eye irritation.
  • 🥗 Despite being more expensive, sunions are rich in antioxidants and vitamins, contributing to overall health benefits.
  • 🌍 Initially cultivated in the U.S., sunions are gradually expanding into new markets despite facing challenges like higher costs and a milder flavor.

Onions are a staple in kitchens around the world, known not only for their unique flavor but also for their tear-inducing properties. When cut, onions release an enzyme that interacts with sulfur compounds, leading to the release of a gas that causes eye irritation. This has been a culinary conundrum for years, prompting various hacks to combat the tears. However, a breakthrough in agricultural science has introduced the “sunion”, a new breed of onion that promises a tear-free experience. Developed by Bayer, this innovation has been available in the U.S. since 2018, and it is gradually making its presence known in other markets.

The Science Behind Tearful Onions

Onions are a culinary necessity, yet they bring a downside—tears. The root of this problem lies in the presence of alliinase, an enzyme released when an onion is cut. This enzyme interacts with sulfur compounds in the onion, resulting in the formation of propanthial-S-oxide, a compound responsible for stimulating our tear glands. Various methods have been suggested to counteract this effect, such as chilling the onion in the freezer before cutting or wearing protective eyewear. Despite these methods, the issue persists for many.

Enter the sunion, a product of over three decades of research by Bayer. Introduced to the U.S. in the late 2010s, sunions are grown in select regions in Nevada and Washington. Initially cultivated over an area of 310 square miles, with a yield of 20 tons per square mile, these onions have garnered attention due to their unique properties. Although they come at a premium, being three times more expensive than regular onions, they offer a tear-free experience, making them a sought-after commodity in certain regions.

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The Tear-Free Promise of Sunions

The development of sunions marks a significant achievement in agricultural science. Created through natural crossbreeding techniques without genetic modification, sunions have been specifically engineered to contain lower levels of propanthial-S-oxide. This innovation ensures that the onions do not irritate the eyes, fulfilling their promise of being tear-free. Furthermore, sunions undergo a maturation process post-harvest, which further reduces their potential to cause irritation.

Consumer feedback has been overwhelmingly positive, with 93% of individuals stating they experienced no tearing or eye irritation when handling sunions. In addition to their tear-free nature, sunions retain their nutritional value, being rich in antioxidants and vitamins A, B, and E. These nutrients are crucial for boosting the immune system, combating cellular aging, and promoting healthy blood circulation due to their anti-inflammatory and antibacterial properties.

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The Nutritional Edge of Sunions

While sunions excel in offering a tear-free culinary experience, they also boast substantial health benefits. These onions are packed with antioxidants and essential vitamins that contribute to overall well-being. The presence of vitamins A, B, and E in sunions aids in strengthening the immune system, making them a valuable addition to any diet. Their anti-inflammatory and antibacterial properties also support cardiovascular health, ensuring improved blood circulation.

Despite their nutritional advantages, some critics argue that sunions lack the robust flavor and aroma typical of traditional onions. This is attributed to the reduced levels of sulfoxides, which contribute to the pungency of regular onions. However, the trade-off between flavor and the convenience of a tear-free experience is a decision that many consumers are willing to make, as they prioritize ease of use over intensity of taste.

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Challenges and Future Prospects

As with any innovation, sunions face their share of challenges. The higher cost compared to regular onions is a potential barrier for widespread adoption. Additionally, the reduced flavor profile may deter some culinary enthusiasts who prefer the strong taste of traditional onions. Nonetheless, the demand for sunions continues to grow, particularly among those who value convenience and simplicity in cooking.

The future of sunions looks promising as they expand into new markets. As more consumers become aware of their benefits, the adoption rate is likely to increase. This begs the question: will the convenience of tear-free onions outweigh the desire for the robust flavors of traditional onions in the evolving culinary landscape?

This article is based on verified sources and supported by editorial technologies.

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Gabriel Cruz
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Gabriel Cruz has been a journalist at Sustainability-Times.com for five years. Trained in journalism in London, he is also a passionate activist for environmental justice and sustainable development. Contact: [email protected]

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View 8 Comments
8 Comments
  1. Xavierpatience on 07/16/2025 8:05 AM

    Finally, onions that won’t make me cry!? What a time to be alive! 😂

    Reply
  2. Carol_crystal on 07/16/2025 8:43 AM

    Thank you, scientists! My eyes have suffered enough over the years. 🙌

    Reply
  3. bernardsong on 07/16/2025 9:20 AM

    This sounds amazing, but will they taste just as good in a caramelized onion dish?

    Reply
  4. Aurelia on 07/16/2025 10:00 AM

    Are sunions available in Canada yet?

    Reply
  5. Florence_universe9 on 07/16/2025 10:39 AM

    Wow, I can’t wait to try these! My glasses always fog up when I cut onions. 🤓

    Reply
  6. matthew on 07/16/2025 11:16 AM

    Great innovation, but at what cost? Are they really worth three times the price?

    Reply
  7. Charlotte on 07/16/2025 11:56 AM

    What’s next, tear-free garlic? 😉

    Reply
  8. Catherine on 07/16/2025 12:34 PM

    Will these be available in Europe soon?

    Reply
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