Sparkling Ginger-Lemon Ice Cubes

In an 8-quart saucepan, combine sugar, water, and ginger slices. Heat to a boil, stirring occasionally until the sugar dissolves. Remove from heat.

Stir in lemon juice and let it cool for 15 minutes. Discard the ginger slices, then refrigerate the lemonade for at least an hour or until chilled.

Fill a glass with the chilled lemonade, add ice cubes, and top off with sparkling water. Garnish with lemon slices.