Combine sugar, salt and chili powder on a plate and stir well to combine before dipping each glass.

Rim a glass with a lime or grapefruit wedge and dip in the salty sugar to coat. Fill the glass with crushed ice.

In the glass, add the tequila, grand marnier, lime juice, grapefruit juice and syrup. Stir for a few 30 seconds. Add a few lime wedges and stir. Drink up!