If you're using fresh cranberries, wash them thoroughly.
If you opt for dried or frozen cranberries, have them ready to go.
In a small saucepan, bring 1 1/2 cups of water to a boil.
If you're using cinnamon for added spice, add it to the water as it heats.
Once the water reaches a rolling boil, add the hibiscus flowers or tea bag and cranberries to the saucepan.
Reduce the heat to a simmer and let the mixture steep for about 5-7 minutes. The tea should start to take on a vivid red hue.
Taste a small spoonful to gauge the tartness. If it's too strong, you can add more water; if it's too light, allow it to simmer for another minute or two.
Remove the saucepan from the heat and stir in the honey or agave nectar. If you're using lemon slices for added tartness, add them now.
Use a fine-mesh strainer to pour the tea into your favorite cups, discarding the hibiscus and cranberries. If you used a cinnamon stick, you can leave it in the cup for garnish or additional flavor.
For an extra layer of flavor, consider adding a pinch of cinnamon or a cinnamon stick to each cup before serving.