Fill a cocktail shaker about halfway with ice.
Ice
Pour in the tequila, lime juice, cranberry juice, orange liqueur, and simple syrup and shake until cold, about 15 seconds.
2 ounces tequila, 1 ounce fresh lime juice, 1½ ounces pure unsweetened cranberry juice, ½ ounce Cointreau, 1 tablespoon simple syrup
Add simple syrup to a small plate and add salt or sugar to a separate small plate, dip the rim of the glass in the syrup then in the salt or sugar.
1 tablespoon simple syrup, Coarse salt or sugar
Add ice to the glass and strain the drink into the prepared margarita glass. Garnish with a slice of lime, cranberries, and a sprig of fresh mint.
Lime slice, cranberries, fresh mint