Pieces of Eight
Puerto Rican Rum, Crushed ice, Passion fruit syrup, Lemon juice, Lime juice
Blend everything and pour unstrained into a tall glass and top with more crushed ice.
I think subbing Flor de Cana (or Havana Club) white might be nice here. The passionfruit syrup can be made by defrosting frozen passionfruit puree and mixing it with an equal part of simple syrup.
From the Pieces of Eight restaurant in Marina del Rey, California