Hibiscus-Ginger Spritz

Bring ginger, dried hibiscus, honey, cinnamon stick, and 2 cups water to a boil. Reduce heat to medium-low; simmer 5 minutes. Remove from heat and let steep 10 minutes. Strain through a sieve into a heatproof container. Add 2 cups water; refrigerate until cold. Pour halfway up ice-filled glasses; top with seltzer.

To spike it: Add 1 ounce light rum per serving, before the seltzer.