Historically, the layers of the onion were believed to draw contagious diseases from the patient; onions were often hung in sickrooms. Today, we know that onions have antibacterial qualities.
Cut up fresh garlic cloves and add them to chicken soup or other foods, or swallow small chunks of raw garlic like pills.
Like garlic and onion, horseradish generates lots of heat to help offset colds. According to one farmer we know, a daily horseradish sandwich is the best cold remedy out there!
Eat loads of hot and spicy foods like chili to clear the sinuses.