Oysters with Cucumber-jalapeño Granita

For my birthday last year, a friend gave me an entire decadent pound of caviar and it inspired me to create a meal around it: caviar with blinis and creme fraiche; a whole smoked salmon; and dozens of fresh oysters topped with this zesty, refreshing granita. I like how its icy texture plays against the oysters' creamy one and how it it enhances--rather than overpowers--their delicate, saline flavor. My favorites are freshly shucked Kumamotos.