Add Sugar Cube: Place 1 cane sugar cube in your Julep cup or Old Fashioned glass.
Add Angostura aromatic bitters: Pour 5 dashes Angostura aromatic bitters over the sugar cube.
Add Ginger Beer: Measure and pour 1 dash Ginger Beer on the sugar cube as well.
Add Ginger Slice: Cut 1 fresh ginger slice in 2 and place it in the glass.
Muddle: Muddle the ginger pieces and the sugar cube together. Make sure to reduce the sugar cube to powder so it will fully 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 Julep cup or Old Fashioned glass.
Add Bourbon: Measure and pour 2 oz Bourbon into the glass.
Add Ice: Fill the glass three-quarters full with crushed ice.
Stir: Using a bar spoon or long stirrer, churn well to combine the ingredients.
Add Ice: Add a straw and top up with more crushed ice.
Garnish: Garnish with a mint sprig and a thin ginger slice. Sprinkle some icing sugar on top and serve immediately.