Guaranteed to open up your sinuses and make you see through time
Peel and mince as much fresh ginger as you think you can handle. Throw it into a pot of water - the amount again depends on what water-to-ginger intensity you think you can stand - and bring to a boil. My old roommate, who used to make this tea for me when I was sick, suggests throwing in some honey to sweeten the tea as soon as it boils. Orange peels are also delicious. It's up to you, but a sweetener is advisable.
Boil until you cannot take it anymore, and then strain out the ginger mincies and/or orange peels. Cool for a bit, and then praise ginger.