Place ginger, lemon peel, and 4 cups of water in a 4-quart saucepan. Bring to a boil over high heat. Simmer at a low boil, uncovered, for about 10 minutes. Add sugar, stirring constantly, and continue to boil until reduced to about 3 cups, another 15 minutes.

Place a fine wire strainer over a large bowl. Pour in ginger mixture to separate solids from liquid. Discard the lemon peel. The strained cooked ginger pieces may be reserved for other uses (good with vanilla ice cream or yogurt), if desired.

Cool the syrup, pour into a glass container, seal tightly, and chill at least 1 hour until cold or up to 1 week.

For each 16-ounce serving, mix 1/4 cup ginger syrup with 1 cup cold club soda and pour over ice. Additional ginger syrup and/or sugar may be added to taste.

Yield: about 4 quarts, 12 servings