Rim the edge of your glass with salt or Tajín seasoning. for a classic margarita touch.
Run a slice of grapefruit along the rim, then dip it into a plate of salt or seasoning to coat evenly.
In a cocktail shaker filled with ice, combine 2 oz of tequila, 1/2 oz. of Cointreau, 2 oz. of fresh grapefruit juice, and 2 oz. of Stonewall Kitchen's Pink Grapefruit Margarita Mix.
Secure the lid on your cocktail shaker and shake vigorously for about 15-20 seconds to chill the mixture and properly blend the flavors.
Strain and serve your margarita by using your cocktail shaker's built-in strainer. Carefully pour the contents into your rimmed glass. Garnish with a slice of grapefruit or a twist of grapefruit peel for an extra visual flair.