How to Make It
Using a sharp knife, peel the grapefruits, removing all of the bitter white pith. Working over a bowl, cut in between the membranes to release the sections; squeeze the juice from the membranes into the bowl.
Transfer 1/2 cup of the juice to a large bowl; save the remaining juice for another use. Add the shallots and let soak for 10 minutes. Stir in the olive oil and honey and season with salt and pepper. Add the sliced fennel and toss to coat. Arrange the fennel on a platter. Scatter the olives, grapefruit sections and fennel fronds on top. Dust lightly with the fennel pollen and serve.