In a large pot, bring 6 cups of water to a boil.
Once the water is boiling, add the rinsed hibiscus flowers. If you wish, add a cinnamon stick, ginger slices, or cloves to enhance the flavour.
Reduce the heat and let the mixture simmer for about 10-15 minutes. The longer you let it steep, the stronger the flavour will be.
Strain the hibiscus tea into a large pitcher, removing the flowers and any added spices. While the tea is still warm, stir in the sugar until it is fully dissolved. Adjust the amount of sugar to your taste preference.
Once the Tea has cooled down, pour into glasses over ice with an optional garnish of lemon and mint.