Combine the sugar, vinegar, and juice in a small nonreactive saucepan. Bring to a boil over high heat. Cook until the mixture has reduced to 1 cup and thickened into a syrup, about 10 minutes. Cool completely before using.
Yield: 1 cup
1 cup sugar
1/2 cup rice wine vinegar
1 cup blood orange juice (from 2 to 3 oranges) or regular orange juice