Pink Grapefruit Sorbet

In a small pot over low heat, combine 1 tablespoon zest, 1 cup juice, and the sugar. Heat slowly until the sugar has dissolved, about 10 minutes. Do not allow juice to boil.

Let cool, then add remaining zest and juice. Whisk in the corn syrup, so that it doesn't accumulate at the bottom of the bowl. Pour mixture into an ice-cream maker and freeze according to manufacturer's instructions.