Grate peeled ginger root. Put it in a pot with 2 cups of cold water, bring to a boil, lower heat, and simmer 5 minutes. Add cayenne pepper (more or less to taste) and simmer 1 minute more. Remove from heat.
Add fresh lemon juice, sweetener to taste, and mashed garlic. Let cool slightly, and strain if desired.
I'm dealing with a cold right now, and I found this tea recipe that makes the sore throat/congestion better until you can ward off the cold for good.
Stolen from Dr. Weil's website.