1 tablespoon grated grapefruit zest 1 tablespoon kosher salt (optional) 1 cup white tequila, chilled 1 cup grapefruit juice, chilled ½ cup lime juice, plus 1 lime wedge ¼ cup Triple Sec 2 tablespoons simple syrup (see Tip) Ice cubes Grapefruit slices for garnish Lime slices for garnish
Sprinkle grapefruit zest on a small plate and combine with salt (if using). Combine tequila, grapefruit juice, lime juice, Triple Sec and simple syrup in a pitcher. Rub the rims of 6 glasses with the lime wedge and dip in the zest (or zest-salt mixture). Fill the glasses with ice and top with about ½ cup margarita mixture each. Garnish with grapefruit and lime slices, if desired.
To make ahead: Cover and refrigerate the margarita mix (Step 2) for up to 2 days.
Tip: 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 1½ cups.