- Spread a thin layer of salt or granulated sugar (if you like things sweet) on a small plate. Moisten the rim of 2 rock or margarita glasses with a lime wedge. Twist and coat the rim of each glass in salt or sugar. Set glasses upright and fill each one 3/4 full with ice.
- Place blueberries in a cocktail shaker and use a cocktail muddler to thoroughly mash them (see Note). Add tequila, liqueur, juices, icing sugar and 1/2 cup ice cubes to shaker, then put on the lid.
- Holding the shaker firmly together, vigorously shake it for 20 seconds. Divide and strain the mixture between prepared glasses, making sure you get every last drop. Set a few whole blueberries in each drink, garnish with a lime wedge and serve.
Note: A muddler is long-handled bartender's tool used to mash cocktail ingredients. They are sold at fine kitchenware stores. If you can’t find one, use the top of the handle of a metal whisk to mash the blueberries.