Pour the spiced rum, silver rum, orange juice, passion fruit juice, grenadine, and lemon juice into a small pitcher. Stir to combine.
Fill two 14-ounce hurricane glasses with ice. Pour in the cocktail.
Garnish with an orange slice and two maraschino cherries. Serve immediately.
Notes
This recipe can easily be doubled, tripled, or quadrupled to serve a crowd! The original recipe makes 16 ounces, which is enough for one very large cocktail or two smaller cocktails.