1 lime, cut in wedges
1 cup ruby red grapefruit juice
1/2 cup freshly squeezed lime juice
1 cup Grand Marnier
1 cup Tequila
2 cups ice
Combine the grapefruit juice, lime juice, orange liqueur, and ice in a blender and puree until smooth or serve on the rocks. Pour into a large pitcher and stir in the tequila. Pour into salted Margarita glasses.