Drambuie Sour

2.0 fl. oz. of Drambuie
0.5 fl. oz. of Lemon Juice
1 teaspoon of Caster Sugar
Ice
Soda Water

Garnish

Mixing Procedure

Combine all ingredients (except Soda Water) in a cocktail shaker with the ice, shake, strain into a highball glass, top with Soda Water.