Shake (all but ginger beer and orange twist) once without ice and once with ice, strain into a Collins glass with 2 oz ginger beer, garnish with an orange twist, and add a straw.
We had a very dry, rather carbonated, and spicy ginger beer (it was a 6% fermentation to get it that dry). Anything matching spicy over more ginger ale sweet is preferable, but use what you got.
In April 2017, a reader of my blog from San Francisco was back in Boston and visiting Loyal Nine. One of his tablemates approached the bar and asked for a drink to end out the West Coast visitor's evening. Instead of a Flip, I decided to go in the style of a New Orleans (a/k/a Ramos) Fizz using three different amari. For the trio, I selected Fernet, Averna, and Cynar; and instead of soda water, I opted for ginger beer akin to the Fernet Buck. The end result was so good, that the original requester of the drink got envious and asked if he could have one as well (and that second one is the the one in the photo above). I feel that the amari could be swapped around depending on inventory and preference, but it was one aggressive, one funky, and one smooth as the balance.