Tangy passion fruit juice (a boxed brand like Ceres is fine) and cinnamon-y Angostura bitters help to balance the richness of cream of coconut in this piña colada from Cyllan Hicks of Clyde's Caribbean in Brooklyn.
Combine passion fruit juice and cream of coconut in a blender. Process until smooth, about 1 minute. Store in an airtight container in refrigerator up to 1 week. Shake well before using.
To make 1 drink, combine 6 tablespoons passion fruit–coconut mixture and rum in a cocktail shaker. Fill with ice; cover and shake until well chilled, about 12 seconds. Strain into a highball glass filled with ice, and top with Angostura bitters. Serve immediately.