Doubleplusgood

Begin by dry-shaking all ingredients, except the bitters, vigorously without ice to combine them and create a frothy texture.

Add ice to the shaker and shake once more to chill the mixture thoroughly.

Double strain the cocktail through a fine mesh strainer into a chilled Old Fashioned glass, ensuring the drink remains free of ice.

Carefully drop aromatic bitters onto the foam, creating two plus symbols.

For garnish, draw two plus signs in the foam using the aromatic bitters.