Rinse 1 cup dried hibiscus flowers
Boil 4 cups water
Add the hibiscus flowers to the boiling water
Simmer for 5 to 10 minutes
Remove from heat
Let steep for 10 to 15 minutes
Strain out the flowers
Add 4 to 6 cups cold water
Sweeten with sugar to taste
Stir until dissolved
Serve over ice