2 oz vodka
4 oz grapefruit juice
Coarse salt (for the rim of your glass)
Lemon (or lime) wedges for garnish
Dip the rim of a martini glass in lemon juice, and then dip into salt. In a martini shaker mix together vodka, grapefruit juice, and ice. Pour into salted-rim glass, and garnish with a wedge of fresh lemon or lime.