Most people think, "Avocado? In a drink?" Avocado is a great textural element; it adds a nice creaminess, but without the cream. It's especially good in a Margarita and goes really well with chips and salsa. The avocado flavor is not overpowering. It's more like a great Margarita with a creamy element to it. The key to this drink is the salt. I'm not a huge fan of salt with my Margaritas, but this drink needs it. And if you want to get a little crazy, add some celery salt and crushed green peppercorns to the salt garnish.
Wet the outside rim of a rocks glass with the lime wedge. Dip rim into the salt and set aside.
In a mixing glass, muddle the avocado with the cilantro, lime juice, and simple syrup. Add the tequila and triple sec. Top with ice and shake vigorously. Strain over fresh ice in the rimmed rocks glass. Garnish with a lime wedge.