Step 1.
- Rim a highball glass with salt by rubbing a grapefruit wedge around the lip and then dipping it into a plate of salt.
Step 2.
- Fill the glass with ice cubes.
Step 3.
- In a shaker, combine 2 ounces of vodka and 4 ounces of grapefruit juice.
Step 4.
- Shake gently to mix the ingredients.
Step 5.
- Strain the mixture into the prepared glass over the ice.
Step 6.
- Garnish with a slice of grapefruit.