Preparation Purée cantaloupe in processor; transfer to large bowl. Add remaining ingredients; stir to dissolve sugar. Pour mixture into 9-inch square metal baking pan. Freeze mixture until partially set, whisking twice, about 2 hours. Freeze uncovered without whisking until completely set, at least 3 hours or overnight. Run tines of fork across surface of granita to form icy flakes. Cover with foil; freeze until ready to serve or up to 2 days. Mound granita in 6 ice-cold Martini glasses. Serve immediately.
Preparation Purée cantaloupe in processor; transfer to large bowl. Add remaining ingredients; stir to dissolve sugar. Pour mixture into 9-inch square metal baking pan. Freeze mixture until partially set, whisking twice, about 2 hours. Freeze uncovered without whisking until completely set, at least 3 hours or overnight. Run tines of fork across surface of granita to form icy flakes. Cover with foil; freeze until ready to serve or up to 2 days. Mound granita in 6 ice-cold Martini glasses. Serve immediately.