I saw this on the new Martha Stewart show. It looks easy and yummy!

One (6-inch) piece ginger, skin left on, thinly sliced crosswise, and roughly chopped
Light-brown sugar (optional)

1. Place ginger in a small saucepan with 2 cups water
2. Simmer for 30 minutes.
3. Remove from heat.
4. Strain into 2 teacups.
5. Sweeten with sugar, if desired.