01 - Bring 4 cups of water to a boil in a medium saucepan over high heat.
02 - Remove saucepan from heat and stir in dried hibiscus flowers. Cover and let steep for 10 minutes to extract full flavor and color.
03 - Pour the mixture through a fine mesh strainer into a large pitcher. Discard the used hibiscus flowers.
04 - While tea is still warm, add granulated sugar and stir until completely dissolved. Incorporate honey or agave syrup if using.
05 - Stir in fresh lime juice and 3 cups of cold water until well combined.
06 - Refrigerate the tea for at least 1 hour to allow flavors to meld and beverage to reach optimal serving temperature.
07 - Fill serving glasses with ice cubes, pour chilled hibiscus tea over ice, and garnish with fresh lime slices and mint leaves.