Rum-Punch Granita

Directions

1. 1
   Combine first 6 ingredients in medium bowl.
2. 2
   Mix in bitters, if desired.
3. 3
   Pour mixture into 15x10x1-inch baking sheet.
4. 4
   Freeze until icy at edges of sheet, about 25 minutes.
5. 5
   Whisk to distribute frozen portions evenly.
6. 6
   Freeze again until mixture is icy at edges of sheet and overall texture is slushy (for beverage), about 25 minutes longer.
7. 7
   Then freeze until mixture is solid (for granita), about 45 minutes.
8. 8
   Use fork to scrape granita into icy flakes.
9. 9
   Cover and freeze at least 1 hour and up to 2 days.
10. 10
    Scoop granita into goblets.
11. 11
    Garnish with fruit and mint and serve.