Hibiscus Grape Ice Tea

1. Pour 700ml / 23.67fl oz boiling Water over 5 tsp dried Hibiscus flowers in a teapot and let it steep, covered, for about 10 minutes.
2. Strain the tea through a sieve and let it cool in the fridge (this takes about 3 hours).
3. Meanwhile, wash the Orange with hot water, dry it, and cut it into slices.
4. To serve, mix the cooled tea with 300ml / 10.14fl oz Grape juice and add the Orange slices. Distribute into glasses and add ice cubes if desired.