Shake all but bitters w/ ice until well chilled. Strain back into the tin (discarding ice). Shake again to aerate. Strain into a chilled cocktail glass. Garnish w/ bitters and an aloe leaf.
Added minced aloe to the tequila, shook vigorously and let sit overnight. Strained thoroughly and rebottled.
Nothing more than in interesting margarita riff, but interesting on every level.