- 1/3 cup sugar
- 8 sprigs thyme
- 2 cups apple cider
- 1 1/2 cups dark rum
- 3/4 cup fresh lime juice
- 1 teaspoon Angostura bitters
- Club soda
- 8 sprigs thyme
- 8 lime slices
- Bring sugar and 1/3 cup water to a boil in a small saucepan, stirring to dissolve sugar. Remove from heat, add thyme sprigs, and cover. Let stand 10 minutes, then strain into a small jar. Let cool.
- DO AHEAD: Syrup can be made 1 month ahead. Cover and chill.
- Mix thyme syrup, cider, rum, lime juice, and bitters in a pitcher. Divide among rocks glasses filled with ice; top off with club soda. Garnish with thyme sprigs and lime slices.
- DO AHEAD: Thyme syrup, cider, rum, lime juice, and bitters can be mixed 4 hours ahead. Cover and chill.