Combine the blood orange juice* and agave in a 8×8 inch Pyrex dish and whisk to combine.
Place in the freezer for 1 hour.
Remove from the freezer and scrape with a fork to break up pieces.
Place back in freezer for 1 hour.
Remove from the freezer and scrape with a fork to break up pieces.
Repeat this process over several hours until granita is similar to shaved ice.
Serve in orange peel “shells” or in bowls (cover the pan with tin foil to keep in the freezer).
* 4 cups of blood orange juice = about 8 oranges