01 - Bring water to a rolling boil in a saucepan over high heat.
02 - Remove from heat, stir in dried hibiscus flowers, cover and steep for 10 minutes.
03 - Pour mixture through a fine mesh strainer into a pitcher, discarding spent flowers.
04 - Whisk in honey or agave syrup until fully dissolved, then stir in lemon juice.
05 - Allow tea to reach room temperature, then refrigerate for at least 1 hour until thoroughly chilled.
06 - Fill glasses with ice cubes, pour chilled hibiscus tea over ice, and garnish with fresh lemon slices and mint sprigs.