Add 60 ml Old Monk dark rum, 22 ml fresh lime juice, 12 ml simple syrup, 7.5 ml orange liqueur (if using), and 2 dashes Angostura bitters into a shaker or mixing glass filled with ice.

Mix

Shake vigorously for 10–12 seconds (for a slightly frothy, well-chilled drink) or stir for 20–30 seconds if you prefer less dilution and a silkier texture.

Prepare glass

Place one large ice cube or several ice cubes into a chilled rocks (old-fashioned) glass.

Strain

Strain the cocktail over the ice in the rocks glass using a Hawthorne or fine strainer to remove small ice shards and pulp.

Garnish & Finish

Express orange oils

Take an orange peel and hold it about 3–4 inches above the drink. With the peel facing down, give it a quick squeeze to express oils over the surface, then run the peel around the glass rim and drop it into the drink.

Optional lime garnish

If desired, garnish with a lime wheel or wedge on the rim for visual contrast and an optional bright aroma.

Serve immediately and enjoy. Adjust sweetness by increasing or decreasing simple syrup to taste.

Cleanup

Rinse and dry the shaker, strainer, and spoon after use.