From Kitchen Scraps to Antioxidant Gold: What a New Onion Peel Study Means for Sonication in Cooking
Every year, kitchens throw away tonnes of onion peels without a second thought. They're the part of the onion nobody wants: papery, bitter, destined for the compost bin or the bin bag. A new peer-reviewed study published in Scientific Reports (Nature Portfolio) in August 2026 makes a strong case for why that should change, using a technique that will sound very familiar to anyone following the sonication movement in professional kitchens: ultrasound. Researchers from Sana'a University and Ibb University in Yemen set out to answer a deceptively simple question: what's the best way to pull antioxidant compounds out of onion peel? In other words, how can a waste product become a usable ingredient? They focused on a specific local cultivar called 'Ba Fatim', a red onion peel identified as an underused source of bioactive plant compounds. And they didn't just test one extraction method. They ran a direct head-to-head between two...