24 ml ginger beer, chilled
6 ml dark rum
2 ml fresh lime juice
1 tablespoon grated ginger, plus 4 slices for garnish (optional)
2 lime slices, halved (optional)
Fill a large pitcher with ice. Stir in beer, rum, juice and grated ginger. Divide evenly among 4 glasses; garnish each with 1 slice ginger and 1 slice lime, if desired. Serve Dark and Stormy Cocktail chill.