Shake; strain; rock; garnish.
For the arbol syrup: Dissolve equal parts sugar and water on heat. Throw in a handful of arbol chilis and keep on low simmer. After ten minutes, fish out the chilis, cut them in threes, and throw them back in. After five more minutes (or whenever desired spiciness is achieved), take off heat, strain, and cool.
Figuring out what to do with this chili syrup, I thought I'd try a Penicillin riff.