Prep Work: Chill your cocktail glass in the freezer for at least 10 minutes.
Mix Ingredients: Add rum, fresh lime juice, simple syrup, maraschino liqueur, and orange bitters to your cocktail shaker.
Add Ice: Fill the shaker about ¾ full with fresh, cold ice cubes.
Shake Vigorously: Shake for 12-15 seconds until the outside of the shaker feels frosty in your hands.
Double Strain: Pour through both the Hawthorne strainer and a fine mesh strainer into your chilled glass to get rid of ice shards and lime pulp.
Garnish: Pop a thin lime wheel on the rim of the glass.
Serve it right away, while it's icy cold. If you did it right, you’ll see a light froth on top from all that shaking.