In a large saucepan, bring 2 quarts water, the hibiscus, ginger, cinnamon, cloves, and orange and lemon zests to a boil over medium heat.
Boil for 5 minutes. Remove from heat.
Add the lemon juice, cover tightly, and let stand for 1 to 2 days at room temperature.
Strain and discard the solids.
Sweeten to taste with demerara sugar, honey, or agave nectar.
Chill thoroughly. Serve over ice and garnish with mint.