Prepare 4 molds with twenty-four 0.4 oz/11 g cavities or 3 molds with thirty-two 0.4 oz/11 g cavities with colored cocoa butter or couverture as desired.
Cast the molds with the white couverture.
In a medium pot, combine the cream, passion fruit puree, sugar, and lemon juice and bring to a boil over medium heat.