01 - Bring 4 cups of water to a boil in a medium saucepan over high heat.
02 - Remove saucepan from heat, add dried hibiscus flowers, and let steep for 10 minutes.
03 - Strain the tea into a large pitcher, discarding the hibiscus solids.
04 - While tea is still warm, stir in sugar until fully dissolved. Add honey or agave syrup if desired.
05 - Add lime juice and 3 cups of cold water to the pitcher. Stir well to combine.
06 - Refrigerate for at least 1 hour to chill thoroughly.
07 - Fill glasses with ice cubes, pour hibiscus tea over, and garnish with lime slices and mint leaves.