Serve in a

Garnish:

Express lemon zest, twist over the cocktail and use as garnish.

How to make:

Add 3 large ice cubes to a mixing glass, then add 4 dashes of Angostura bitters, 45ml of Limoncello, 40ml of Luxardo Sour Apple Liquere, and 5ml of elderflower syrup. Stir until the mixing glass is chilled.
In an old fashioned glass, add one ice cube, pour in the mixture, express and garnish with a lemon zest.