Limes for rimmer and garnish
1 cup fresh grapefruit juice (240ml)
Juice of 1 lime
1 oz. orange syrup (30ml)
3 oz. tequila (90ml)
Rub the rim of two cocktail glasses with a lime wedge. Dip in margarita salt. Add ice to the glasses, taking care to avoid disturbing the salt rim.
Combine the grapefruit juice, lime juice, orange syrup and tequila in a small spitcher and stir together. Pour over ice in prepared cocktail glasses. Garnish with a lime wedge.