Ingredients
12  cups water
1/4  cup sugar
3  inches fresh ginger, peeled and thinly sliced
12  to 16  green tea bags 

Directions
1. Combine water, sugar, and ginger in a large saucepan. Bring to boiling; reduce heat. Simmer, covered, for 5 minutes. Remove from heat. Add tea bags; let stand, covered, for 3 minutes.
 
2. Remove tea bags. Strain ginger from tea; discard ginger. 

3. Transfer tea to a 2-gallon pitcher or punch bowl. Cover and chill for 2 hours or overnight. Makes 12 servings.

  

Source:  Better Homes & Gardens