How to Make It
Stir together sugar, water, and ginger in a medium saucepan. Bring to a boil over high; boil, stirring occasionally, until sugar dissolves, about 1 minute. Remove from heat; stir in turmeric. Let cool completely, about 30 minutes. Pour mixture through a fine mesh strainer lined with cheesecloth into a bowl; discard solids.
Stir together ginger-turmeric syrup, vodka, lemon juice, and honey in a large pitcher or punch bowl until combined. Chill at least 2 hours or up to 24 hours.
To serve, gently stir in chilled club soda; pour into glasses filled with ice.