Over a bowl to catch the juice, remove the peel, including pith, of the grapefruit, and cut it into sections. Arrange the grapefruit on 4 serving plates.
Peel the avocados and cut them into thick slices. Arrange on plates with grapefruit.
In a bowl, combine the grapefruit juice with the limejuice, rose water, and salt.
Season each salad with the white pepper and spoon on the dressing. Decorate with rose petals before serving.
