In advance: Fill an ice cube tray with grapefruit juice and freeze for a few hours until solid or overnight.

When ready to serve: Fill a small shallow dish with salt.

Run a wedge of grapefruit (or use lime) around the rim of each glass. Dip the wet rim into the salt and set aside.

In a blender add; grapfruit juice, tequila, simple syrup and lime juice.

Add 3 to 4 cups grapefruit ice cubes and blend. Add more ice if needed. If too icy, add a splash of grapfruit juice until the mixture is slushy and pourable.

Pour into prepared glasses, garnish with a wedge of grapfruit (if desired) and serve immediately.