Ingredients:

1 1/2 oz vodka
2 oz grapefruit juice
2 oz grapefruit soda
Grapefruit wedge, for garnish
Salt for the rim of the glass

Method:

Pour coarse salt onto small plate. Moisten the rim of a highball glass. Gently dip the rim into salt to coat lightly. Fill your glass with ice cubes. Pour the vodka over ice and follow with the grapefruit juice and grapefruit soda. Stir and garnish with a grapefruit wedge.