There is a myth (and a circulating email) that states placing cut onions around your home helps ward off colds and flu. The myth has pretty much been debunked. However, you CAN help ward off and reduce your symptoms by EATING ONIONS. Onions are rich in antioxidants and have antiseptic and ant-inflammatory properties. It can dry your congested sinuses, reduce phlegm, and reduce your cough, among other healthful benefits.
Eating onions raw is best, as it can quickly clear up some of that congestion. Mince the onion well, mix with honey, and eat a spoonful. You can also try making onion tea by adding a chopped onion to 3 cups of boiling water. (Feel free to add some honey to this as well). Allow the water to warm and drink throughout the day. If you have a hard time tolerating raw onion or onion tea, add a hearty amount of onions to a healthy vegetable soup or other cooked dishes.