Shake lightly - enough to marry the ingredients together (you're dealing with citrus, right!) but not enough to overly-dilute the ingredients.
Strain, into a rocks glass over a large ice cube - express the oils from a large swath of orange rind.
Bitters are 'house bitters' but I use Regan's.
I tried to re-create this cocktail as best I could - there's no recipe online to loot. This is my best guess. If anyone has connections to the folks at the Violet Hour, I welcome some fact-checking.
Was on the menu at the Violet Hour in Summer 2012