Fresh grapefruit juice adds a zesty punch and lovely pink color to this refreshing skinny margarita. For the perfect finish, upgrade the salt rim on your glass by mixing in a little grapefruit zest to add to both the presentation and flavor.
To make ahead: Cover and refrigerate the margarita mix (Step 2) for up to 2 days.
To make your own simple syrup: Bring 1 cup sugar and 1 cup water to a boil in a medium saucepan, stirring frequently to dissolve the sugar. Let cool for 30 minutes and then refrigerate until cold, at least 1 hour. Makes about 1 1/2 cups.