Add remaining ingredients and fill shaker with ice.
Shake, and strain into a rocks glass.
*Lemon simple syrup:
INGREDIENTS: 1.5 cups Water 2.75 cups White sugar .5 cups Lemon juice
PREPARATION: Add all ingredients to a sauce pot and bring to a low boil over medium heat. Stir until the sugar dissolves completely. Allow the mixture to cool, then transfer to a sealable container. Keep refrigerated for up to two weeks.
Grapefruit cocktails are definitely one of my favs. I liked this recipe a lot. Another one I like I found it here: http://charliebouzin.com/index.php/2015/06/11/nice-and-easy-grapefruit-cocktail/ for those who want more grapefruit cocktails