In a saucepan stir together 1 cup sugar and 1/2 cup water. Bring to a boil and remove from heat. Allow to come to room temperature. Add 3/4 cup fresh squeezed lemon juice and 3/4 cup fresh squeezed lime juice. Store in an airtight container in the refrigerator. Will last for one week.
To make a cucumber martini ,fill a glass tumbler or martini shaker with lots of ice. Add 1 1/2 ounces each of gin, sweet and sour and cucumber juice. Add some fresh mint and top with the metal tumbler or shaker lid. Shake like crazy and pour into a chilled martini glass. Top with a splash of Sierra Mist and Enjoy!