Traditional margaritas are known for their salted rim, but you can have a little fun with this one, and combine salt and sugar. Run a lime wedge along the rim of a cocktail glass, then dip into a small dish of sugar and salt.
In a large shaker, combine all of the liquid ingredients and add a large handful of ice.
Shake vigorously; increase the depth of color by adding a bit more cranberry juice.
Garnish with a lime wedge, and consider layering some orange liqueur on top if you wish.