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["In 4 tall, footed glasses, place 1 small scoop of coconut sorbet and pack the ice cream down into the bottom of the glasses with the back of a spoon.", "Top with about 1 tablespoon of the chopped pineapple, about 1 1/2 teaspoons of the toasted coconut, and drizzle with about 1 tablespoon of the rum.", "Continue with the remaining ingredients, so there are 4 layers of each, ending with pineapple and rum on top, pressing with a spoon to ""seal"" each layer.", "Place the parfaits in the freezer for at least 30 minutes.", "Remove from the freezer and top each with 2 tablespoons of whipped cream and garnish with white chocolate shavings.", "Serve immediately.", "To make the simple syrup: In a heavy medium saucepan, combine 1 cup of the water and sugar and bring to a boil over high heat.", "Reduce heat to medium-low, stir, and simmer until the sugar dissolves, about 5 minutes.", "Remove from the heat and cool slightly.", "In a 2-quart saucepan, combine the coconut milk, remaining 1 1/2 cups water, lemongrass and ginger.", "Bring to a boil.", "Reduce heat to medium-low and simmer for 10 minutes, stirring occasionally.", "Remove from the heat.", "Add the simple syrup and stir well.", "Strain through a fine mesh strainer into a clean container.", "Cool in the refrigerator for at least 2 hours.", "Pour into an ice cream machine and process according to the manufacturer?s instructions.", "Transfer to an airtight container and freeze until ready to serve.", "Yield: about 1 quart"]