Add sugar cube: Place 1 sugar cube in your julep cup or old-fashioned glass
Add Angostura bitters: Pour 5 dashes Angostura aromatic bitters over the sugar cube.
Add soda water: Measure and pour 1 tsp soda water.
Muddle: Muddle the sugar cube to make sure it will dissolve later on.
Add mint: Place 6-8 fresh mint leaves in one hand and gently smack it with the other, to release its aromas. Add the mint to the mixture.
Add Bourbon: Measure and pour 2 oz Bourbon into the glass.
Add Ice: Fill the glass three-quarters full with crushed ice.
Stir Gently: Use a bar spoon to stir the ingredients.
Add more ice: Top up with more crushed ice.
Garnish: Place a mint sprig into the glass and sprinkle some icing sugar on top for garnish.