1 oz Campari¾ oz red grapefruit juice½ oz cranberry juice (unsweetened)½ oz Fernet Branca¼ oz simple syrup (1:1)2 oz champagne
instructions :

Combine all ingredients, except sparkling wine, and shake with ice.
Strain into a chilled glass and top with sparkling wine.

source :
imbibemagazine.com