Goal: maek an island mule

Which of the following methods is more reasonable for accomplishing this goal?
1.5 oz Blackwell Rum .5 oz Tempus Fugit Creme de Cacao .5 oz simple syrup .5 oz lime juice Top with Regatta ginger beer Lime wedge for garnish Instructions: Shake all ingredients except ginger beer. Double strain into a highball glass filled with ice. Top with ginger beer. Garnish with a lime wedge.