1/2 cup granulated sugar
1 1/2 teaspoons grated citrus peel (1 lime, 1 lemon, 1 orange, or part of a grapefruit)
In a small bowl, mix sugar with citrus peel, crushing with the back of a spoon to release flavor. Serve, or seal airtight and store at room temperature until flavor fades, up to 1 month.
Nutritional analysis per teaspoon.