Step 1

Sprinkle grapefruit zest on a small plate and combine with salt (if using).

Step 2

Combine tequila, grapefruit juice, lime juice, Triple Sec and simple syrup in a pitcher.

Step 3

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 1/2 cup margarita mixture each. Garnish with grapefruit and lime slices, if desired.