On a small plate spread salt.

With lime wedges moisten rim of 6 ounce glasses.

Dip glasses into salt.

Place glasses into freezer to chill.

In a pitcher combine tequila, broiled grapefruit juice, lime juice and Cointreau and candied grapefruit syrup (if using)

Remove glasses from freezer and serve margarita mixture over ice.

Garnish with candied grapefruit slices.