Special equipment: shaker strainer rocks glass citrus squeezer plate
In a shaker, combine 2 oz. silver tequila, 1/2 oz. Cointreau, 1 oz. simple syrup and the juice of half a lime and let sit.
On a plate, mix the sugar and dried lavender and use it to rim the outside of a rocks glass.
Fill the glass with ice. Shake and strain the contents of the strainer into the glass.