Free Silver

• 1/2 oz Dark rum
• 1 1/2 oz Gin
• Juice of 1/4 Lemon
• 1/2 tsp Powdered sugar
• 1 tblsp Milk
• Carbonated water

Shake all ingredients (except carbonated water) with ice and strain into a collins glass over ice cubes. Fill with carbonated water, stir, and serve.