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["In a small saucepan, heat the lemon zest and lime zest with the sake over medium-high heat until the sake is evaporated.", "Set aside to cool.", "In a separate saucepan, mix water, sugar, yuzu juice, lemon juice, lime juice, and corn syrup and bring to a boil over medium-high heat.", "Reduce heat to low and simmer without stirring until all the sugar has dissolved, about 3 to 5 minutes.", "Remove pot from heat and let syrup cool completely.", "Add the lemon and lime zest, then pour into a shallow baking dish or plastic container and place in the freezer.", "(The 6 cup capacity shallow plastic containers with a lid that measure 6 inches by 10 inches by 2 inches deep, and which you can get in grocery stores would be ideal for the purpose.)", "Check after about 2 hours and stir the mixture.", "After about 4 hours, the mixture will have begun to set up, and you can score the surface by turning a spoon backwards and using the tip to scrape the frozen syrup into ""ice curls.""