1 cup water
1/4 cup sugar
1/4 cup torn verbena leaves
3/4 cup dry gin
3/4 cup club soda, chilled
1/4 cup fresh lime juice (about 2 limes)
Lemon verbena sprigs (optional)
Lime slices (optional)
Combine 1 cup water and sugar in a small saucepan. Rub torn verbena to bruise; add to pan. Bring sugar mixture to a boil, stirring gently as needed to dissolve sugar evenly; cook 30 seconds. Remove from heat; cool completely. Strain mixture through a sieve over a bowl; discard solids.
Combine sugar mixture, gin, soda, and juice. Serve over ice. Garnish with verbena sprigs and lime slices, if desired.