In a small pot, add 4 cups of water and the dried hibiscus flowers. Bring to a boil over high heat.
Reduce heat to low, cover and simmer for 5 minutes.
Remove from heat, uncover and let it cool down for 5 more minutes.
Pour the tea through a strainer or colander into a large pitcher that holds at least 8-10 cups. Discard the used used hibiscus flowers.
Add the granulated sugar and stir until completely dissolved. Add the remaining 4 cups water and stir to combine.
At this point, taste the tea and add more sugar and/or dilute it with more water until it's to your liking. Some people like it super sweet, some like it super strong, it's up to you!
Serve in a glass filled with ice and enjoy!
To make one cup of tea at a time - Follow steps 1-4 to make the hibiscus tea concentrate, except instead of pouring the concentrate into a pitcher, pour it into a glass container that holds 4 cups (like this mason jar). Grab a drinking glass and fill it 1/3 of the way up with concentrate and another 1/3 of the way up with water. Mix in 1 teaspoon of sugar at a time until the sweetness is to your liking. Fill the cup with ice and enjoy. Store the remaining concentrate in the fridge.