makes one cup
1/3 cup fresh lemon juice (juice from 2-3 lemons)
1/3 cup fresh lime juice (juice from 3-6 limes)
3 tablespoons fresh orange juice (juice from 1/2 an orange)
1/3 cup super-fine sugar (process regular granulated sugar in a food processor for 2 minutes to get this consistency)
1. Combine the four ingredients.
2. Whisk together until the sugar dissolves in the fruit juices.
3. Use in any cocktail drink that requires sour mix.