Pour the water into a 2-quart (2-liter) saucepan and bring to a simmer. Add the dried hibiscus flowers and simmer for 2 to 3 minutes until the water turns deep red.
Add the apricots and prunes, cover and allow to simmer over medium heat for 5 minutes. Remove from the heat and allow to cool.
Add the fruit and hibiscus tea to the container of a blender. Add ½ cup (100 g) sugar, ½ cup (120 ml) of lime juice, the chili powder and cayenne pepper. Blend until smooth. Taste the mixture and add more sugar, lime juice and/or chili powder as desired.
Once blended, pour the mixture into a serving container. Refrigerate after use.