In an Old Fashioned tumbler, add the cocoa bitters to the sugar cube. Place into the tumbler and add the vermouth. Then add a few ice cubes and the rum. Stir to mix the ingredients and give a small dilution. Add the Strega and some additional ice to finish the drink. Garnish with orange peel and a Maraschino cherry.
¾ oz Strega liqueur
1 oz grapefruit juice
2 dashes Angostura Bitters
2 oz Prosecco
Add of the ingredients, except the Prosecco to a shaker with ice. Shake and strain into a champagne flute. Add the Prosecco and serve.