Preparation Drain lychees, reserving syrup, then purée lychees, cream of coconut, 1/4 cup syrup, and 2 1/2 tablespoons lime juice in a blender until smooth. Freeze in ice cream maker. While sorbet is churning, toss together mango, zest, and remaining lime juice to taste (1/2 to 1 tablespoon). Serve scoops of sorbet over mango slices.
Preparation Drain lychees, reserving syrup, then purée lychees, cream of coconut, 1/4 cup syrup, and 2 1/2 tablespoons lime juice in a blender until smooth. Freeze in ice cream maker. While sorbet is churning, toss together mango, zest, and remaining lime juice to taste (1/2 to 1 tablespoon). Serve scoops of sorbet over mango slices.