Combine batched rum, brandy & PX with lime juice and orgeat in a mixing tin; add ice, shake vigorously and strain into an old fashion rocks glass with fresh ice. Slap a sprig of mint to release the aromatic oils and place it inside the glass.
Yields 10 cocktails:
15 oz El Dorado
10 oz Torres 10
5 oz Cigarrera PX
**Do not batch lime juice or orgeat