Ingredients: 

1-part Fernet-Branca
1-part Coca-Cola

Instructions:

• Chill a highball glass with a couple of ice cubes, remove.
• Add Fernet-Branca, then two or three fresh ice cubes.
• Top up with Coca-Cola, pouring at a 45-degree angle.
• Add an additional ice cube if foam looks set to overflow.