Juice grapefruits and strain out seeds and pulp with a fine mesh strainer.
Prep the pears by peeling them with a vegetable peeler or paring knife and then roughly chopping them.
Combine all ingredients in a blender and pulse until smooth. Pour mixture through a fine mesh strainer and discard fruit pulp. Pour granita mix into a loaf pan or shallow baking dish.
Loosely cover the pan with Saran Wrap and freeze for 2 hours. Remove from freezer and mix well to avoid separation. Return to the freezer and freeze for atleast 2 more hours or until solid.
When ready to eat, scrape the surface of the frozen granita with a fork. Scoop and serve!
Recipe by at https://www.adventuregathereat.com/grapefruit-pear-granita/