Cut 4 long and thin orange peels, and press them firmly onto the inside of a coupe.
Add the rum, syrup and mint to a mixing glass with ice, and stir until chilled.
Strain into the coupe carefully, trying not to disturb the peels, though some will undoubtedly float in the glass.
Gently top with the stout, and yell “Who Dey!”.
*Vanilla simple syrup: Combine 1 cup water, 1 cup sugar and 2 split vanilla beans in a small pot, and stir. Bring to a rolling boil, stirring to prevent scorching. Reduce heat and simmer for 5 minutes. Remove from heat and let cool to room temperature. Strain through a fine sieve and discard the vanilla beans. Will keep in the refrigerator for 2 or 3 weeks.