1 cup water
3/4 cup sugar
1 cup fresh mint sprigs
2 cups lemon-lime soft drink, chilled
1 cup fresh lime juice
1/2 cup tequila
Garnish: fresh mint sprigs, lime slices

Bring 1 cup water and sugar to a boil in a medium saucepan. Boil, stirring often, until sugar dissolves. Remove from heat; add mint sprigs, and let stand 2 hours or until mixture is completely cool.
Pour mixture through a wire-mesh strainer into a pitcher, discarding mint. Stir in lemon-lime soft drink, lime juice, and tequila. Serve over ice. Garnish, if desired