0.5oz Orange liqueur
1 oz Sour mix (equal parts simple syrup*, lime juice and lemon juice)
1 dash Aromatic cocktail bitters
Splash Soda water
Garnish: Orange wheel
Build in a glass over ice. Stir.
How to make simple syrup:
Boil 1 cup of water
Add 1 cup of sugar, stir until dissolved
Remove from heat and allow to cool.
Store in a container in your refrigerator.