Cutting onions can be a tear-inducing chore, but there are several effective methods to prevent or minimize crying while doing so. Understanding the science behind onion-induced tears is the first step to finding a suitable solution. Onions contain a chemical compound called syn-propanethial-S-oxide (SPSO), which is released when the onion is cut. This gas irritates the eyes’ nerve endings, triggering the production of tears.
One common technique to avoid crying is to refrigerate the onion for about 30 minutes before cutting. Chilling the onion slows down the release of SPSO gas, reducing eye irritation. Alternatively, cutting the onion under running water or using a sharp knife can help disperse the gas away from the eyes. Additionally, wearing goggles or contact lenses can create a physical barrier between the gas and the eyes.