Combine all ingredients except the vinegar in a shaker and shake. Strain into a rocks glass with fresh ice. Float vinegar on top. Garnish with half orange wheel. Smile.
This is an insanely bright and gently balanced beverage. If you are trying to recreate using a different vinegar with higher acidity be sure to adjust the sugar and alcohol accordingly.
To make the oleo-saccharum: in tupperware or a zip-top bag combine 1.25 cups sugar and the peel (no white pith) of 2 oranges. Muddle the zest into the sugar until the sugar is moist, and remove the zest.
Created at the oakland for the owop in summer 2011