Citrus-Hibicus Betera Granita

Inspired by our friends @cbcebulski and @mutsumi_nyc recent trip to @carnemare where they had a Grapefruit Campari and Limoncello Granita topped with Prosecco. We had to try it with our bitter bevs!
For the Granita
1 ea Orange Segmented or Supremed
1 ea Grapefruit Segmented or Supremed
1.5 oz Agave
1 ea Betera Rhubarb Hibiscus
2 oz Pomegranate or Cranberry Juice
Blend all till smooth then freeze till hard. Scrap with a fork and spoon into your glass. Add elderflower lime and hit it with some grapefruit and lime zest.