This recipe is from Martha Stuart's Menus for Entertaining. She says, Be sure the grapefruits are fresh and the tequila is of the higest quality. The recipe is made in three batches.
- Fill a blender with chipped ice.
- Add one third of the grapefruit juice, lime juice, tequila, Grand Marnier, and sugar.
- Blend at top speed until frothy.
- Pour into 3 or 4 chilled or salt rimmed glasses and garnish with a lime slice and sprig of mint.
- Repeat twice with the remaining ingredients.