How to make the X-15 Cocktail recipe:
For the X-15 Cocktail recipe put the gin, the falerum, the orgeat syrup, the passion fruit juice and the fresh lemon juice in a cocktail shaker. Shake until all is mixed well fill your glass with crushed ice. Pour everything over the crushed ice and add an orchid flower to garnish your X-15 drink.
This recipe was created by J. "Popo" Galsini in 1967 at the Kona Kai in Huntington Beach California. It was named after X-15 rocket plane which still holds the record as the fastest manned aircraft in history.
Thanks to Boxes and Booze for the recipe.